Course Content
Section Name Topic Name 3 Classification of Elements and Periodicity in Properties 3.1 Why do we Need to Classify Elements ? 3.2 Genesis of Periodic Classification 3.3 Modern Periodic Law and the present form of the Periodic Table 3.4 Nomenclature of Elements with Atomic Numbers > 100 3.5 Electronic Configurations of Elements and the Periodic Table 3.6 Electronic Configurations and Types of Elements: s-, p-, d-, f – Blocks 3.7 Periodic Trends in Properties of Elements
Section Name Topic Name 7 Equilibrium 7.1 Equilibrium in Physical Processes 7.2 Equilibrium in Chemical Processes – Dynamic Equilibrium 7.3 Law of Chemical Equilibrium and Equilibrium Constant 7.4 Homogeneous Equilibria 7.5 Heterogeneous Equilibria 7.6 Applications of Equilibrium Constants 7.7 Relationship between Equilibrium Constant K, Reaction Quotient Q and Gibbs Energy G 7.8 Factors Affecting Equilibria 7.9 Ionic Equilibrium in Solution 7.10 Acids, Bases and Salts 7.11 Ionization of Acids and Bases 7.12 Buffer Solutions 7.13 Solubility Equilibria of Sparingly Soluble Salts
Section Name Topic Name 10 The s-Block Elements 10.1 Group 1 Elements: Alkali Metals 10.2 General Characteristics of the Compounds of the Alkali Metals 10.3 Anomalous Properties of Lithium 10.4 Some Important Compounds of Sodium 10.5 Biological Importance of Sodium and Potassium 10.6 Group 2 Elements : Alkaline Earth Metals 10.7 General Characteristics of Compounds of the Alkaline Earth Metals 10.8 Anomalous Behaviour of Beryllium 10.9 Some Important Compounds of Calcium 10.10 Biological Importance of Magnesium and Calcium
Section Name Topic Name 12 Organic Chemistry – Some Basic Principles and Techniques 12.1 General Introduction 12.2 Tetravalence of Carbon: Shapes of Organic Compounds 12.3 Structural Representations of Organic Compounds 12.4 Classification of Organic Compounds 12.5 Nomenclature of Organic Compounds 12.6 Isomerism 12.7 Fundamental Concepts in Organic Reaction Mechanism 12.8 Methods of Purification of Organic Compounds 12.9 Qualitative Analysis of Organic Compounds 12.10 Quantitative Analysis
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About Lesson

Conformational Isomerism

It arises due to free rotation around C – C bond. We can define it as:

Definition: The different arrangement of atoms in space which can be obtained due to rotation about

C – C bond are called Conformation. It is not totally free but there is energy barrier of 120kJ/mol that has to be overcome.  This is called torsion strain that exist between two forms.

Conformations of ethane: There are two projections.

  •  Sawhorse projection: In this H and C are bonded to each other and is represented in form of lines.

 Newman projection: In this carbon is represented by drawing circles and hydrogen are represented by drawing lines as shown.

The two form of new man projection are: eclipsed and staggered

  • Staggered: In this hydrogen are far apart from each other
  • Eclipsed: this hydrogen are just at back of each other

When staggered is rotated by 600 we get eclipsed form .In this: 600 -torsional angle .Torsional angle is angle by which one form is rotated to get the other form.

Torsional strain: It is the repulsive force that acts and give differnt stability of different forms .

The difference in their energy is given above and this is easily overcome and they keep inter converting.

In this cyclohexane: We have two forms that are shown:

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