MSc Chemistry (Organic And Analytical) SEM I 2023 2024 Feb 2024 ORGANIC CHEMISTRY I Question Paper - Mumbai University | munotes

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1. Q1 Answer any two of the following: How do the following techniques help in determining the mechanism 5 of the reaction?
   • 1)Product analysis
   • ii) Trapping of intermediates b is general and specific catalysis? Explain its mechanism with 5 c Compare the basicity of pyridine, pyrrole, and piperidine. 5 d Give examples and explain the following: 5
2. Q2 Answer any two of the following: a Draw four stereoisomers of 2,3,4-trihydroxy glutaric acid. Label 5 pseudoasymmetric centre present in the stereoisomers and assign Explain the stereochemistry of tri coordinated ‘C’ species namely and explain prochiral center with suitable example. 2 1i)Write stereochemical descriptor to Ha and Hp. 3 the structure of pair of enantiomeric biphenyl with their 2 1i)Write the configurational descriptor to the following molecules 3
3. Q3 Answer any two of the following: inversion of configuration is much more during solvolysis of 5 than (II)? Explain with mechanism (II) b aromatic nucleophilic substitution reaction in pyridine with 5 Explain acid catalyzed hydrolysis of ester using mechanism. 5 aromaticity of the following: 5
4. Q4 Answer any two of the following: What is Corey-Kim oxidation? Give example with mechanism 5 note on Wolf Kishner Reduction. 5 c the product in the following reactions: 5
   • ii) OH Illustrate use of the DIBAL-H and K-selectrids in organic 5 synthesis, with two example each Answer any FIVE of the following: a State the principle of microscopic reversibility 2 b Compare acidity of Trifluoroacetic acid and acetic acid 2 c with suitable example improper axis of symmetry 2 erythro-threo system of nomenclature with suitable examples. 2 e is an antiaromatic compound? Give one example. 2 f | Why cyclopropenyl cation is called smallest aromatic system? 2 g the following reactions. 2 h the use of Red Al in organic synthesis, with two examples. 2

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