( Chemistry Paper-I ) ORGANIC CHEMISTRY: CYCLIC HYDROCARBONS AND THEIR HALOGEN DERIVATIVES Book B.Sc 3rd Sem Biihar

Unit

Topics to be Covered

No. of Lectures

1

Reaction Intermediates:

Carbenes, nitrenes and benzynes: Generation, structure, stability and reactions.

12

2

Chemistry of Cyclic Hydrocarbons:

Nomenclature of monocyclic and bicyclic compounds, Baeyer’s strain theory, conformation of cyclohexane, relative stability of chair, boat and twist boat forms of cyclohexane with their energy level diagram, relative stability of mono and disubstituted cyclohexanes, Aromaticity and Huckel rules with reference to benzenoids, cyclocarbocations and cyclocarbanions, mechanism of electrophilic aromatic substitution in benzene-halogenation, nitration, sulphonation, Friedel - Crafts alkylation/acylation, energy profile diagrams of these reactions, reactivity of mono-subsituted benzene, directive influence of functional groups.

12

3

Chemistry of Halogen Derivatives of Alkanes:

General methods of preparation, properties and uses of mono- and dihalo derivatives of alkanes.

Mechanism of substitution and elimination reactions, viz. S_N1, S_N2, S_Ni, E1, E2 and E1cB mechanism.

12

4

Halogen Derivatives of Arenes:

General methods of preparation, properties and uses of halogen derivatives of arenes.

Mechanism: ArS_N2, ArS_N1, elimination-addition mechanism (benzyne mechanism).

12

Total

48