Download PTU M-Sc -Chemistry 2nd Semester May 2019 71662 ORGANIC CHEMISTRY II Question Paper

Download PTU (I. K. Gujral Punjab Technical University) MSc -Chemistry 2nd Semester May 2019 71662 ORGANIC CHEMISTRY II Question Paper.

1 | M-71662 (S17)-325
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
M.Sc.(Chemistry) (2015 to 2017) (Sem.-2)
ORGANIC CHEMISTRY ? II
Subject Code : MSCH-201
M.Code : 71662
Time : 3 Hrs. Max. Marks : 100
INSTRUCTION TO CANDIDATES :
1. Candidate is required to attempt 5 (FIVE) questions in ALL.
2. Attempt one question each from SECTION A, B, C and D.
3. Section E is compulsory. All questions carry EQUAL marks.

SECTION-A
Q1. a. Explain briefly relationship between elements of symmetry and optical activity.
b. Discuss the chirality of allenes.
Q2. Comment on the configuration and conformational aspects of disubstituted cyclohexane
derivatives. How their chirality depends upon the nature of substitutents R and R?.
SECTION-B
Q3. What do you understand by supramolecular catalysts? Discuss the role and mechanism of
supramolecular catalysts.
Q4. Explain cryptands, fullerenes and crown ethers with suitable examples.
SECTION-C
Q5. Draw correlation diagram for [4n + 2] cycloaddition reaction and explain why it is thermally
allowed and photochemically symmetry forbidden?
Q6. a. Discuss the mechanism of the photoreduction of benzophenone leading to the formation
of benzpinacol.
b. Discuss with mechanism Barton reaction.
SECTION-D
Q7. Discuss with mechanism for following reactions :
a. Suzuki reaction
b. Stille reaction
c. Hydroboration
d. Metathesis of alkynes.
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1 | M-71662 (S17)-325
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
M.Sc.(Chemistry) (2015 to 2017) (Sem.-2)
ORGANIC CHEMISTRY ? II
Subject Code : MSCH-201
M.Code : 71662
Time : 3 Hrs. Max. Marks : 100
INSTRUCTION TO CANDIDATES :
1. Candidate is required to attempt 5 (FIVE) questions in ALL.
2. Attempt one question each from SECTION A, B, C and D.
3. Section E is compulsory. All questions carry EQUAL marks.

SECTION-A
Q1. a. Explain briefly relationship between elements of symmetry and optical activity.
b. Discuss the chirality of allenes.
Q2. Comment on the configuration and conformational aspects of disubstituted cyclohexane
derivatives. How their chirality depends upon the nature of substitutents R and R?.
SECTION-B
Q3. What do you understand by supramolecular catalysts? Discuss the role and mechanism of
supramolecular catalysts.
Q4. Explain cryptands, fullerenes and crown ethers with suitable examples.
SECTION-C
Q5. Draw correlation diagram for [4n + 2] cycloaddition reaction and explain why it is thermally
allowed and photochemically symmetry forbidden?
Q6. a. Discuss the mechanism of the photoreduction of benzophenone leading to the formation
of benzpinacol.
b. Discuss with mechanism Barton reaction.
SECTION-D
Q7. Discuss with mechanism for following reactions :
a. Suzuki reaction
b. Stille reaction
c. Hydroboration
d. Metathesis of alkynes.
2 | M-71662 (S17)-325
Q8. Account for the following :
a. Reaction of CO and hydrogen,
b. Carbonylation reaction
c. Phase transfer catalyst
d. Hydrosilylation

SECTION-E
Q9. a. Comment on the chirality of following biphenyls :

1 2
b. Write the conformations of 1,3-dimethylcyclohexane. Discuss the chirality of cis and
trans- isomers.
c. Differentiate enantioselectivity and diastereoselectivity.
d. What is the role of micelles in supramolecular chemistry?
e. What kind of interactions are possible in supramolecular complexes?
f. What is the principle of complementarity and pre-organization?
g. Show the product and mechanism of the following sigmatropic pericyclic reaction :

h. What do you understand by chemiluminescent reactions? Give one example.
i. Draw the mechanism of Negishi reaction.
j. Write an example of oxidation-addition reaction.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.

COOH
O N
2
COOH
O N
2
COOH
NO
2
COOH
NO
2
O
heat
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