Time : 3 Hours
Maximum Marks : 50
N.B. :— (1) All questions are compulsory and carry equal marks.
(2) Draw well labelled diagram wherever necessary.
1. (A) What is hybridisation ? Explain the structure of Ethylene molecule on the basis of hybridisation. [5M]
(B) Discuss Homolytic and Heterolytic fission of covalent bond with suitable example. [5M]
(C) Write a note on Inductive effect. [2½M]
(D) Discuss hydrogen bonding with reference to alcohol. [2½M]
(E) Define the terms with suitable example :
(i) Substitution reaction and
(ii) Elimination reaction. [2½M]
(F) Classify the following as electrophiles and nucleophiles :
(i) FeCl3 (ii) H2O (iii) CH3NH2 (iv) BF3 and (v) AlCl3. [2½M]
2. (A) What is Optical activity ? Discuss optical isomerism in Tartaric acid and Lactic acid. [5M]
(B) Define conformation. Discuss conformational isomerism of n-butane. [5M]
(C) Explain geometrical isomerism in Maleic and Fumaric acid. [2½M]
(D) Write a note on Newman’s projection and Sawhorse formulae of Ethane. [2½M]
(E) Discuss D and L nomenclature with suitable example. [2½M]
(F) What is Resolution ? Explain biological method of resolution [2½M]
3. (A) What is Peroxide effect ? Explain free radical mechanism of addition of HBr to propene. [5M]
(B) Discuss Baeyer’s strain theory. Give its limitations. [5M]
(C) Discuss the mechanism of chlorination of methane molecule. [2½M]
(D) Write a note on L.P.G. [2½M]
(E) How will you prepare ethylene from :
(i) Ethyl alcohol and
(ii) Ethyl bromide ? [2½M]
(F) Discuss Ionic mechanism of addition Br2 to ethylene. [2½M]
4. (A) What are dienes ? How they are classified ? What is the action of :
(i) Bromine and
(ii) HBr on 1, 3-butadiene ? [5M]
(B) What is aromatic electrophilic substitution reaction ? Discuss mechanism of nitration of benzene
with energy profile diagram. [5M]
(C) Explain acidic nature of ethyne. [2½M]
(D) Discuss the Diels—Alder reaction. [2½M]
(E) Discuss molecular orbital structure of Benzene. [2½M]
(F) What is Huckel rule ? Explain aromaticity of cyclopentadienyl anion. [2½M]
5. Solve any TEN of the following :—
(i) Define Carbonium ion.
(ii) Draw M.O. Structure of Ethane molecule.
(iii) Give one example of addition reaction.
(iv) What is Asymmetric synthesis ?
(v) What is meant by stereogenic centre ?
(vi) What is racemisation ?
(vii) Draw structure and give IUPAC name of neopentane.
(viii) What is the action of O3 on Ethylene ?
(ix) Define Octane number.
(x) What is oxyacetylene flame ?
(xi) Give the polymerisation reaction of acetylene.
(xii) State Huckel’s rule of aromaticity. [10M]