BSc Sem V 2015 2016 2016 Chemistry 2 Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 Answer any three of the following 5 marks
   • (A) What is Pinacol-pinacolone rearrangement? Give an example and
   • (B) (a) What are kinetically controlled reactions? Explain with any two 3
   • (b) State and explain Hofmann rule of elimination. 2
   • (C) (a) Write the products formed in the following reactions ethereaction 3
   • (b) Explain nucleophilicity with example
   • (D) (a) Give the mechanism the following reaction. 3
   • (b) Explain the of Beckmann rearrangement with a suitable 2
   • (E) (a) What is E1 reagtion? Discuss its mechanism
   • (b) Complete reactions 2
   • (a) Give the mechanism involved in the acid catalysed esterification 3
   • (b) What is Benzilic acid rearrangement? Give an example. 2
2. Q2 Answer any three of the following Calculate angle
   • (A) Explain the concept of ‘angle strain'in their planar cyclopropane, cyclobutane and cyclop entane, structures. ism and
   • (B) Complete the following reaction. Explain its
   • C) Draw two chair conformations each of cis and trans 5 diethylcyclohexane. Which of the four conformers 1S stable? Why?
   • (D) Explain mechanism and stereochemistry of brominat trans-2-butene 5
   • (E) of chirality of spirans with
   • (F) Explain mechanism and stereochemistry of bagginduced dehydro genation 5 of 1-bromo-1,2-dipheny! propane. Why called anti-elimination
3. Q3 Answer any three of the following S
   • (A) (a) What are monosaccharides? the importance of amphiprotic solvent in the mechanism of mut tion
   • (b) Write the open chain for the following ring structures
   • (B) () Write a note on Kiliani-Fische ) (a) What are epimers and 2
   • (b) How will you convert D(+) a ive 3
   • (D) (a) Assuming configuration of D (+) glucose derive the configuration of 3
   • (b) Complete the following reactions. 2 &
   • (E) (a) Explain : glucose is a reducing sugar whereas sucrose is reducing 3 sugar. What is the action of HIO, on glucose?
   • (b) Write the stepwise reactions of excess of phenyl on glucose
   • (F) (a) Write the structures of the following
   • (i) 1,3- oxazole
   • (b) Give the IUPAC names of : 2 4, Answer any three of the followidy
   • (A) (a) Explain Hofmaga exhaustive methylation & elimination reaction with 3
   • (b) Write synthesis for preparation of pyrrole. 2
   • (b) resonance structures of furan. 2
   • (C) (a will you convert?
   • (ii) to thiophene
   • (iii) to Tetrabromopyrrole
   • (b) Discuss the aromaticity of pyridine
   • (D) Explain 'multicomponent synthesis' with any two examples. 5
   • (E) Write synthesis of the following:- 5s
   • (a) Indigo from anthranilic acid
   • (b) Green synthesis
   • (F) Explain the use of microwaves in organic synthesis with any two examples
4. Q5 (A) Choose the right answer from the alternatives given below and rewrite the completed
   • (b) Saytzeff elimination of alkyl halide forms olefin as the
   • (c) Sulphonation of naphthalene at given a mixture of
   • (d) In the alkaline hydrolysis of an ester, the end are
   • (A) State whether the following are true or false 4
   • (p) Basicity is a kinetic pro
   • (q) preferably from the syn-periplanar } Anions have than neutral molecules
   • (s) 1s a self- condensation of esters without
   • (B) Fill in the blanks
   • (b) In reactions, a levorotatory substrate no In catalytic hydrogenation, a cis substrate ct
   • (B) State whether the following molecules are chiral or achiral. 4
   • (C) Write the structures of the following compounds. 4
   • (a) 1-bromo-1,2 -pentadiene S
   • (b) 6-bromospiro [3, 5] nonane
   • (d) 3-methylbicyclo [4,2,0] octane
   • (C) Give the IU PAC names of the following 4
   • (D) Complete the following reactions:
   • (D) Match the columns appropriately :- >

Read from the scan above, so a character or two may differ. The scan is the original.