Roll No.
Total No. of Pages : 02
Total No. of Questions : 19
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M.Sc. (Chemistry) (Campus) (2015 to 2017) (Sem.-3)
CONNECTION AND DISCONNECTION APPROACH IN ORGANIC SYNTHESIS
Subject Code : CHL-504 M.Code: 74892
Time: 3 Hrs.
Max. Marks : 70
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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.
SECTION-A
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- How five-membered ring can be synthesized?
- What do you mean by 'Disconnection Approach'?
- Discuss strategy of radical reaction in organic synthesis.
- What are synthons?
- What are ketenes?
- Discuss disconnection approach for synthesis of amine.
- Write one example of one group C-X disconnection in carbonyl compound.
- What do you mean by reconnection?
- By taking suitable example discuss regioselectivity.
- What is the special job acetylene can do in organic synthesis?
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SECTION-B
- Discuss umpolung (reversal of polarity) of carbonyl compound by taking suitable examples.
- “If the carbon framework of the target molecule (TM) is difficult to construct, one strategy is to construct a slightly different framework by conventional reaction and rearrange it to the TM”. Justify the statement with suitable example.
- Discuss any two examples for advanced strategy in disconnection approach.
- Discuss two group C-X disconnection in 1,5- difunctionalized compounds with example.
- Write a brief note on :
- Chemoselectivity
- Cyclization reaction
- Discuss one group C-C disconnection by taking suitable examples.
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SECTION-C
- What do you mean by order of events? Discuss importance of the order of events in organic synthesis by taking suitable examples.
- Explain two group C-X disconnections in 1,2- and 1,4- difunctionalized compounds by taking suitable examples.
- Discuss in detail disconnection approach for aromatic heterocycle with special emphasis on five- and six- membered rings.
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: PTU M.Sc Chemistry Last 10 Years 2010-2020 Previous Question Papers|| Punjab Technical University
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