Andhra University 2007 B.E organic chemistry - Question Paper
Wednesday, 01 May 2013 04:20Web
II Year B.E./B.Tech Degree exam
ORGANIC CHEMISTRY
Chemical Engineering
Time: three hours Max.Marks: 75
ques. one is compulsory
ans any 4 from ques. two to 8
All ques. carry equal marks
1. a) What is the optical activity? provide the criteria. 3M
b) Why it is more difficult to nitrate nitrobenzene than
benzene? 3M
c) What is Diazotization? discuss the coupling reaction
with an example. 3M
d) How do you synthesise tertiary alcohols through
Grignard’s method? 3M
e) Fructose decreases Fehling’s solution. Being a
ketohexose. discuss. 3M
2. a) A compound A, molecular formula C11 H11 NO4, on
treatment with aqueous NaOH yields. Ethanol and
compound B provide C, C9 H1 NO4 which is soluble in
aqueous sodium carbonate with effervescence.
Catalytic reduction of B provide C, C9 H11 NO2, which
can be diazotized. Vigorous oxidation of B provide a
compound which can be prepared by the action of nitric
acid and sulphuric acids on benzoic acid. explain their
reactions. 10M
3. a) At low temperature, the 1, 2-addition product of the
reaction of HBr and 1,3-butadiene is. major product
of the reaction. At higher temperature, the 1,4-addition
9
product is the major product. Write a complete
explanation. 8M
b) Write a note on Wurtz reaction.
4. a) Classify amines giving examples. explain the effect of
substituents on the basicity of aromatic amines. 8M
b) Write a note on sulpha drugs. 7M
5. a) Illustrate with examples, how in aromatic compounds
further substitution is governed by the nature of
substituent already current in the ring. 9M
b) Write a note on Friedel Crafts alkylations and its
limitations. 6M
6. Write notes on:
a) Perk inconsideration 5M
b) Wiliamson Synthesis 5M
c) Fries rearrangement. 5M
7. a) How Primary, Secondary and Tertiary alcohols are
distinguished from 1 another? 9M
b) explain the industrial preparation of phthalic acid.6M
8. a) define the ring structure of D-glucose. 7M
b) How will you convert D-glucose into Fructose and
Vice-Versa?
Earning: Approval pending. |