National Institute of Technology 2006 B.Tech Chemical Engineering ORGANIC CHEMISTRY (Elective) CY 205; Quiz Test - II (09-09-) - Question Paper

NATIONAL INSTITUTE OF TECHNOLOGY KARNATAKA, SURATHAKAL, DK.
Chemistry Department III Sem. B.Tech. (Chem. Engg)

ORGANIC CHEMISTRY (Elective) CY 205; Quiz Test - II (09-09-2006)
Time: 1/2 hr. Max. Marks: 20


What is diazotization reaction ? provide its mechanism.

How would you convert aniline to 1,3,5- tribromobenzene ?

What is Borsch's reagent ? What is its use ? How is it synthesized ?

elaborate heterocyclic compounds ? How are they classified ? discuss with examples

discuss the mechanism of nitration of thiophene. '

provide reasons for the following:
(i) Coupling of benzene diazonium salt takes place only with aromatic compounds containing
group like OH, NH2. (ii) Coupling of phenol is carried out in a weakly alkaline medium while that with anilines in
weakly acidic solution.


provide reasons: (i) Thiophene is more aromatic in nature than furan. (ii) Pyrrole is acidic but
not furan.


How are the subsequent compounds prepared ?
(1)2-Formyl pyrrole (2) Furan-2-sulphonic acid (3)Thiophene-2-carboxylic acid (4)THF
9.

provide any 2 methods of synthesis of furan.
10. Give reasons for the following:
(i) Pyrrole has higher boiling point than thiophene (ii) Pyrrole is not basic even though it contains NH group.

Earning:   Approval pending.