Basic concepts of organic chemistry such as structural formulas, different kinds of representation, types of isomerism, examples, alkanes, alkenes, alkynes etc.
Basic concepts of organic chemistry such as structural formulas, different kinds of representation, types of isomerism, examples, alkanes, alkenes, alkynes etc.
In chemistry, hybridisation (or hybridization) is.pdfsutharbharat59
In chemistry, hybridisation (or hybridization) is the concept of mixing atomic
orbitals to form new hybrid orbitals suitable for the qualitative description of atomic bonding
properties. Hybridised orbitals are very useful in the explanation of the shape of molecular
orbitals for molecules. It is an integral part of valence bond theory. Although sometimes taught
together with the valence shell electron-pair repulsion (VSEPR) theory, valence bond and
hybridization are in fact not related to the VSEPR model.[1] Contents [hide] 1 Historical
development 2 Types of hybridisation 2.1 sp3 hybrids 2.2 sp2 hybrids 2.3 sp hybrids 3
Hybridisation and molecule shape 3.1 Explanation of the shape of water 3.2 Controversy
regarding d-orbital participation 4 Hybridisation theory vs. MO theory 5 See also 6 External
links 7 References [edit]Historical development Chemist Linus Pauling first developed the
hybridisation theory in order to explain the structure of molecules such as methane (CH4).[2]
This concept was developed for such simple chemical systems, but the approach was later
applied more widely, and today it is considered an effective heuristic for rationalizing the
structures of organic compounds. For quantitative calculations of electronic structure and
molecular properties, hybridisation theory is not as practical as molecular orbital theory.
Problems with hybridisation are especially notable when the d orbitals are involved in bonding,
as in coordination chemistry and organometallic chemistry. Although hybridisation schemes in
transition metal chemistry can be used, they are not generally as accurate. Orbitals are a model
representation of the behaviour of electrons within molecules. In the case of simple
hybridisation, this approximation is based on atomic orbitals, similar to those obtained for the
hydrogen atom, the only atom for which an exact analytic solution to its Schrödinger equation is
known. In heavier atoms, like carbon, nitrogen, and oxygen, the atomic orbitals used are the 2s
and 2p orbitals, similar to excited state orbitals for hydrogen. Hybridised orbitals are assumed to
be mixtures of these atomic orbitals, superimposed on each other in various proportions. The
theory of hybridisation is most applicable under these assumptions. It gives a simple orbital
picture equivalent to Lewis structures. Hybridisation is not required to describe molecules, but
for molecules made up from carbon, nitrogen and oxygen (and to a lesser extent, sulfur and
phosphorus) the hybridisation theory/model makes the description much easier. The
hybridisation theory finds its use mainly in organic chemistry. Its explanation starts with the way
bonding is organized in methane. [edit]Types of hybridisation [edit]sp3 hybrids Hybridisation
describes the bonding atoms from an atom\'s point of view. That is, for a tetrahedrally
coordinated carbon (e.g., methane, CH4), the carbon should have 4 orbitals with the correct
symmetry to bond to the 4 hydrogen atoms. The .
In chemistry, hybridisation (or hybridization) is.pdfsutharbharat59
In chemistry, hybridisation (or hybridization) is the concept of mixing atomic
orbitals to form new hybrid orbitals suitable for the qualitative description of atomic bonding
properties. Hybridised orbitals are very useful in the explanation of the shape of molecular
orbitals for molecules. It is an integral part of valence bond theory. Although sometimes taught
together with the valence shell electron-pair repulsion (VSEPR) theory, valence bond and
hybridization are in fact not related to the VSEPR model.[1] Contents [hide] 1 Historical
development 2 Types of hybridisation 2.1 sp3 hybrids 2.2 sp2 hybrids 2.3 sp hybrids 3
Hybridisation and molecule shape 3.1 Explanation of the shape of water 3.2 Controversy
regarding d-orbital participation 4 Hybridisation theory vs. MO theory 5 See also 6 External
links 7 References [edit]Historical development Chemist Linus Pauling first developed the
hybridisation theory in order to explain the structure of molecules such as methane (CH4).[2]
This concept was developed for such simple chemical systems, but the approach was later
applied more widely, and today it is considered an effective heuristic for rationalizing the
structures of organic compounds. For quantitative calculations of electronic structure and
molecular properties, hybridisation theory is not as practical as molecular orbital theory.
Problems with hybridisation are especially notable when the d orbitals are involved in bonding,
as in coordination chemistry and organometallic chemistry. Although hybridisation schemes in
transition metal chemistry can be used, they are not generally as accurate. Orbitals are a model
representation of the behaviour of electrons within molecules. In the case of simple
hybridisation, this approximation is based on atomic orbitals, similar to those obtained for the
hydrogen atom, the only atom for which an exact analytic solution to its Schrödinger equation is
known. In heavier atoms, like carbon, nitrogen, and oxygen, the atomic orbitals used are the 2s
and 2p orbitals, similar to excited state orbitals for hydrogen. Hybridised orbitals are assumed to
be mixtures of these atomic orbitals, superimposed on each other in various proportions. The
theory of hybridisation is most applicable under these assumptions. It gives a simple orbital
picture equivalent to Lewis structures. Hybridisation is not required to describe molecules, but
for molecules made up from carbon, nitrogen and oxygen (and to a lesser extent, sulfur and
phosphorus) the hybridisation theory/model makes the description much easier. The
hybridisation theory finds its use mainly in organic chemistry. Its explanation starts with the way
bonding is organized in methane. [edit]Types of hybridisation [edit]sp3 hybrids Hybridisation
describes the bonding atoms from an atom\'s point of view. That is, for a tetrahedrally
coordinated carbon (e.g., methane, CH4), the carbon should have 4 orbitals with the correct
symmetry to bond to the 4 hydrogen atoms. The .
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
3. Introduction
Organic chemistry is the study of the structure, properties, composition, reactions, and preparation of carbon-
containing compounds, which include not only hydrocarbons but also compounds with any number of other
elements, including hydrogen, nitrogen, oxygen, halogens, phosphorus, silicon, and sulphur.
This branch of chemistry primarily deals with the structure and chemical composition of organic compounds, the
physical and chemical properties of organic compounds, and the chemical reactions undergone by these
compounds. Advancements in the field of organic chemistry have made numerous contributions to human
society, such as the synthesis of several drugs, polymers, and other natural products. Synthetic organic chemistry
is an important application of organic chemistry that deals with the design and construction of organic
compounds for practical purposes.
The range of application of organic compounds is enormous and also includes, but is not limited to,
pharmaceuticals, petrochemicals, food, explosives, paints, and cosmetics.
4. Carbon
Carbon is unique in its chemical properties because it forms a number of components superior than the
total addition of all the other elements in combination with each other.
Due to the specific properties of the element, Carbon has established its importance among the other
elements. The properties which make carbon so important are:
Catenation
Tetravalency
Size of a carbon atom
Although there is no specific definition, the compounds in solid, liquid or gaseous state which contain
covalently bonded carbon atoms in their molecules are known as organic compounds.
5. Hybridization of Carbon
Hybridization is the concept of combining atomic orbitals to make new hybrid orbitals appropriate to
represent their properties of bonding. Hybridized orbitals are helpful in describing the shape of molecular
orbitals apart from being a major part of valence bond theory.
The name hybrid applies to the atomic orbitals that contribute to the hybridization. For example, in
methane whose chemical formula is CH4, a set of sp3 orbitals develops by combining one s-orbital and
three p-orbitals on the carbon atom. These orbitals direct towards the four hydrogen atoms placed at the
vertices of a regular tetrahedron.
Ethene (C2H4) consists of a double bond between the carbon atoms. Here, the carbon hybridizes by sp2.
In sp2 hybridization, the 2s orbital mingles with two among the three 2p orbitals available, making total
3sp2 orbitals with one remaining p-orbital.
6. In ethane, two atoms of carbon develop a sigma bond by overlaying two sp2 orbitals, where every carbon
atom makes two covalent bonds with hydrogen by overlapping all s-sp2 with 120◦ angles. The pi bond
among the carbon atoms develops by a 2p-2p overlap. The hydrogen-carbon bonds have equal length and
strength that satisfies with experimental proof.
Many bonds also exist between non-similar atoms. When two atoms of oxygen are brought near opposite
sides of the carbon atom in CO2, one among the p orbitals on every oxygen makes a pi bond with anyone
among the p-orbitals of carbon. Here, the sp hybridization forms two double bonds.
Hybridization of Carbon
7. Tetravalency of carbon
1. Catenation – Catenation can be defined as the self-linking of atoms of an element to form chains and
rings. This definition can be extended to include the formation of layers (two-dimensional catenation)
and space lattices (three-dimensional catenation).
2. Tetravalency and small size – Carbon exhibits’ tetravalency. The tetravalency of carbon can be satisfied
by forming bonds with carbon, hydrogen or other atoms. The carbon atom has 4 electrons in its valence
shell. In order to account tetravalency it is believed during the process of bond formation which is energy-
releasing process the two electrons in the 2s orbital get unpaired and out of them, one is promoted to
empty orbital
8. Ground state electronic configuration of carbon is 1s2, 2s2, 2p2. It has 4 valence electrons, so the
probability of formation of four bonds is maximum. The bonds formed by the s orbital electrons
will not be the same as that of p orbital electrons. So in the formation of one molecule of CH4,
there will be a combination of 1 C atom with 4 H atoms.
The following types of bonds can be formed: C(s)-H(s), C(s)-H(s), C (p)-H(s) and C (p)-H(s). Out of
the four bonds, we have two ‘directional’ C (p)-H(s) and two non-directional bond C(s)-H(s). (Note:
As we know that s orbitals are spherical and do not have any specific direction and p orbitals have
shapes in three directions x, y, and z-axis.) The strength of the bond will also differ as C (p)-H(s)
bond will be less strong than the C(s)-H(s) bond as s overlapping is stronger
But practically all the bonds of CH4 are identical. This creates a problem. To solve this problem,
hybridization theory has been stated. It is mainly a concept in which atomic orbitals are mixed
with new hybrid orbitals which are most suited for the pairing of electrons to form chemical
bonds. It can be understood by the fig given below:
9. In the fig, three p and one s-orbital are hybridized to give four
identical sp3 hybridized orbitals.
Similarly, we can also get sp and sp2 hybridization.
The only change will be that sp2 will have only two p orbitals.
Now from the VSEPR theory, we know that sp and sp2
hybridized molecules are planar in structure.
Whereas sp3 hybridized molecules take tetrahedral shape to
become more stable (this structure leads to minimum energy
state).
10. Structural Representation of Organic Compounds:
Though an organic compound has only one chemical formula, structurally it can be depicted in numerous
ways. The three structural formulas – complete structure, condensed structure, and bond line structural
formulas are explained below.
Complete Structural Formula:
The Lewis dot structure is considered as the complete structural formula. In Lewis structure, the covalent
bonds in the compound are denoted by a dash (―). This helps to emphasize the number of bonds
formed by the electrons. Every single bond, a double bond, and a triple bond are represented by one
dash, double dash, and triple dash respectively. It illustrates every single bond formed between every
atom in the compound, thus called complete structural formula.
11. Condensed Structural Formula:
Since complete structural formula consumes much time and space to represent the structure, we can
condense them. This is the condensed structural formula, where replacing some dashes/bonds by a
number of identical groups attached to an atom by a subscript.
Bond Line Structural Formula:
A bond lines structural formula is another way of structural representation of organic compounds. Here, every
bond is represented as a line in a zigzag manner. If not specified, every terminal is assumed to be a methyl (-
CH3) group.
12. 3-D Representation of Organic Compounds:
The organic compounds which were represented using structural formulas in the previous section are three-
dimensional compounds. In order to draw the 3-D structure of an organic compound, we can use wedge-
dash representation.
The bond that protrudes out of the plane of paper towards the viewer is denoted by a solid wedge while
that project away from the viewer or into the plane of the paper is denoted by a dashed wedge and the
bond in the plane of the paper is represented by a line.
13. 1.Acyclic or Open Chain Compounds & Alicyclic or Closed Chain or Ring Compounds – Organic compounds
are classified as open-chain compounds and closed chain compounds in terms of the carbon chain. Also
termed as Organic Compounds Acyclic or Open Chain or Aliphatic Compounds Cyclic or Closed Chain or
Ring Compounds Alkanes Alkenes Alkynes
2.Aromatic Compounds – Plants and micro-organisms have an exclusive route to benzene-ring
compounds. The great majority of aromatic compounds in nature, therefore, are produced by plants and
microorganisms, and animals are dependent upon plants for many aromatic compounds either directly
or Indirectly.
3.Heterocyclic Aromatic Compounds – In the twentieth century it is witnessed that the first inorganic
heteroaromatic compound produced in the laboratory. Some of these heterocyclic aromatic compounds
are very important in biochemical processes, drugs, and agrochemicals.
Classification of Organic Compounds
15. Nomenclature of Organic Compounds - IUPAC
What is IUPAC Nomenclature?
IUPAC nomenclature of organic compounds refers to the systematic approach taken for the nomenclature of
organic compounds as per the recommendation of the International Union of Pure and Applied Chemistry
(often abbreviated to IUPAC).
A set of rules formulated by IUPAC (the International Union of Pure and Applied Chemistry) for systematic
nomenclature of organic compounds which is revised from time to time. The IUPAC nomenclature of organic
compounds essentially consists of three parts which are stem name, prefix and suffix.
It is interesting to note that the existence of preferred IUPAC names does not prevent the use of other names
to take into account a specific context or to emphasize structural features common to a series of compounds.
Preferred IUPAC names belong to a “preferred IUPAC nomenclature”. Any name other than a preferred IUPAC
name (as long as it is unambiguous and follows the principles of the IUPAC recommendations herein) is
acceptable as a general IUPAC name in the context of a “general IUPAC nomenclature”.
16. According to the Guidelines set by IUPAC, the nomenclature of compounds must follow these steps:
1.The Longest Chain Rule: The parent hydrocarbon must be identified and subsequently named. The parent chain
belonging to the compound in question is generally the longest chain of carbon atoms, be it in the form of a straight
chain or a chain of any other shape.
2.The Lowest Set of Locants: The carbon atoms belonging to the parent hydrocarbon chain must be numbered using
natural numbers and beginning from the end in which the lowest number is assigned to the carbon atom which carries
the substituents.
3.Multiple instances of the same substituent: Prefixes which indicate the total number of the same substituent in the
given organic compounds are given, such as di, tri, etc.
4.Naming of different substituents: In the organic compounds containing multiple substituents, the corresponding
substituents are arranged in alphabetical order of names in the IUPAC nomenclature of organic compounds in question.
5.The naming of different substituents present at the same positions: In the scenario wherein two differing substituent
groups are present at the same position of the organic compound, the substituents are named in ascending alphabetical
order.
6.Naming Complex Substituents: Complex substituents of organic compounds having branched structures must be
named as substituted alkyl groups whereas the carbon which is attached to the substituent group is numbered as one.
These branched and complex substituents must be written in brackets in the IUPAC nomenclature of the corresponding
compounds.
Nomenclature of Organic Compounds - IUPAC
17. Nomenclature of Organic Compounds - IUPAC
The IUPAC nomenclature of alkanes, alkenes, and alkynes are discussed in the subsections below.
1. Alkanes
The General formula of alkanes corresponds to CnH2n+2
The suffix ‘ane’ is generally used to describe alkanes. Examples for the nomenclature of alkanes as per IUPAC
guidelines include methane for the compound CH4 and Butane for the compound C4H10
2. Alkenes
The General formula of alkenes is described as CnH2n
The suffix ‘ene’ is used to describe alkenes via IUPAC norms. Examples for the nomenclature of alkenes
include the name ethene used to describe the compound given by C2H4 and Propene used to describe the
compound given by C3H6
3. Alkynes
The General formula of alkynes is CnH2n-2
The suffix ‘yne’ is generally used to describe alkynes. An example of the IUPAC nomenclature of alkynes is:
ethyne used to describe the compound given by C2H2
18. Nomenclature of Organic Compounds - IUPAC
Example of IUPAC Nomenclature
Considering the following Example:
•There exist 9 carbon atoms on the straight chain and the 5th carbon atom (from both ends of the chain)
consists of a substituent group which in turn has 3 carbon atoms in a chain.
•Furthermore, there the first and second carbons of this substituent chain have an additional CH group
attached to them.
•In the nomenclature of this compound, the 9 membered carbon chain is identified as the parent chain and is
numbered.
•The substituent chain attached to position 5 of the parent chain is 3 members long, with 2 methyl groups
attached at positions 1 and 2.
•Thus the carbon chain substituent group on the parent chain can be called 1,2 dimethyl propane. The name
for the substituent chain containing this compound would be 1,2 dimethyl propyl.
•Substituting this name on the parent chain, the IUPAC name of the compound in question is found to be: 5-
(1,2 dimethyl propyl) nonane.
19. 1. Fundamental Concepts
- Tetravalence of carbon;
- Carbon Chain linear cyclic;
- Concept of isometry;
- Nomenclature.
2. General concepts on
- The saturated hydrocarbons: methane;
- Unsaturated hydrocarbons: ethylene, acetylene;
- The aromatic hydrocarbons: chloroform;
- The halogen derivatives of hydrocarbons
TRICHCMOROETHYLENE ;
- The alcohols methanol, ethanol;
- The PWnols;
- The aldehydes: formaldehyde;
- The ketones: acetone;
- The organic acids: acetic acids;
- The amines, methylamine;
Page 68 of 572
- The acids: aniline