JNTU,B Tech,i-Semester Organic Chemistry,November 2008

JNTU,B.Tech,I-Semester Organic Chemistry,November 2008

(Chemical Engineering)

SET-4

 

1. Discuss the following effects of resonance

(a) Dipole moment

(b) bond length

(c) Strength of acids and bases

(d) Stability of free radicals and carbonium ions. [4×4]

 

2. (a) Discuss about hydroboration with reaction mechanism.

(b) Describe the Perkin condensation. [8+8]

 

3. (a) What is a free-radical ?

(b) How do you get bromine free radicals?

(c) Describe the free-radical mediated addition of HBr to alkenes. [4+6+6]

 

4. (a) Which of the following compounds exhibit optical isomerism?

i. Nitromethane

ii. Methyl chloride

iii. Glyceraldehyde

iv. Ethylene glycol

(b) Describe a method to determine the optical activity of an organic compound.

[8+8]

 

5. (a) How maleic acid and fumaric acid react with acetyl chloride? What inference

you get from this reaction?

(b) Write a note on E and Z configurations of geometrical isomens. [8+8]

 

6. (a) What are Polymers? How are they Classified?

(b) Discuss the importance of Synthetic high polymers.

(c) Describe the preparation of nylon(6) from cyclohexanone. [6+5+5]

 

7. (a) How will you prepare pyrrole? Explain its amphoteric nature.

(b) Complete the following reaction.

i. Thiophene with fuming sulphuric acid in the presence of acetic Anhydride

ii. Isoquinoline with n-butyl lithium.

iii. Pyrrole with nickel catalyst in the presence of H2.

iv. Quinoline with alkaline KMnO4 [8+8]

 

8. Explain the following terms :

(a) Chromophore

(b) Auxochrome

(c) Chromogen

(d) Batho chromic shift

(e) Hypo chromic shift

 

Leave a Comment