problem 1) What are heterocyclic compounds? prepare down the methods of synthesis and reaction of furan.

problem 2) Answer the following:

a) describe the nomenclature of five membered heterocycles containing one heteroatom.

b) prepare down the structure and numbering of

i) Quinoline

ii) Benzimidazole

iii) Oxazole.

c) Give reason thiophene is more stable and more aromatic than pyrrole and furan.

d) Complete the reaction:

i) Thiophene + Raney, Ni/H₂→

ii) Indole + Raney, Ni/H₂→

e) Discuss the Fries rearrangement with mechanism.

problem 3) prepare brief note on:

a) Bayer-Villiger oxidation.

b) Beckman rearrangement

c) Pinacol-pinacolone rearrangement

d) Cope rearrangement

e) Wagner-Meerwin rearrangement