Roll No.
Total No. of Pages : 02
Total No. of Questions: 19
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M.Sc. (Chemistry) (Campus) (2015 to 2017) (Sem.-4)
ADVANCED ORGANIC CHEMISTRY
Subject Code : CHL-511
M.Code: 74897
Time: 3 Hrs.
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Max. Marks : 70
INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains SIX questions carrying FIVE marks each and students have to attempt ALL questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
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SECTION-A
Answer briefly :
- Explain the meaning of relative and absolute configuration in molecules.
- What are chiral auxiliaries? Explain.
- What is Heck coupling and why it is important?
- What kind of transition states forms in Diels-Alder cycloaddition reaction?
- What is the Michael-addition reaction?
- What is the difference between heterogeneous and homogenous catalyst? Give one example of each.
- Write mechanism of ring-opening metathesis polymerization.
- What is oxidative addition reaction?
- What transition metal frequently uses in the hydrogenation of imine?
- Organometallics need to be kept absolutely free of moisture. Why?
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SECTION-B
- Define stereoselectivity and stereospecificity with proper examples. Explain the key difference between them.
- Write the catalytic cycle of Negishi Coupling.
- What are the importance and challenges of C-H activation?
- Write a note on Cram's rule.
- What do you understand by the chiral pool of comounds. Explain with the examples.
- Write one coupling reaction uses Cu- and Pd-salts as a catalyst in the same catalytic cycle.
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SECTION-C
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- What is the active catalyst in Sonogashira coupling reaction? Schematically demonstrate how (PPh3)2 PdCl2/Et3N pre-catalyst generates the active catalyst.
- What is claisen rearrangement? Explain the mechanism.
- What is transition metal catalyzed carbonylation process? Explain the mechanism of alkene to aldehyde conversion using rhodium catalyzed carbonylation process.
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.
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This download link is referred from the post: VNSGU MBBS Last 15 Years 2010-2025 Previous Question Papers (Veer Narmad South Gujarat University)
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