Total No. of Questions 12] [Total No. of Pages 02
M.Sc. (Previous) DEGREE EXAMINATION, MAY 2018
First Year
CHEMISTRY
Organic Chemistry
Time 3 Hours Maximum Marks :70
SECTION A
Answer any four questions. × 71/2 30)
Q1) Explain about Aromaticity with examples.
Q2) Write a note on effect of conformation on reactivity in cyclohexane derivatives.
Q3) Explain structure and reactivity of carbocation and carbanions.
Q4) Explain the neighbouring group mechanism with examples.
Q5) Write a not on Gattermann Koch reaction.
Q6) Explain the Sandmeyer reaction.
Q7) Explain addition of Grignard reagents to carbonyl and unsaturated carbonyl
compounds.
Q8) Write a note on E1 and E1CB mechanism.
SECTION B
Answer all questions. × 10 40)
Q9) Explain the following.
Cross conjugation
ii) Resonance
OR
Explain about stereospecific and stereoselective synthesis.
(DCHE03)
Q10) Explain methods of determining mechanisms isotopic effects.
OR
Explain SN1 and SN2 mechanism.
ii) Explain about SN1 mechanism.
Q11) Write a note on generation and characteristics of free radicals.
OR
Hydroboration
ii) Michael reaction
Q12) Explain the following:
Knoevenagel
ii) Mannich
iii) Perkin reactions
OR
Write a note on mechanism and orientation in pyrolytic elimination.