What are the characteristics of a compound to be aromatic?
Or
What do you mean by aromaticity?
Or
What are the necessary conditions for any system to be aromatic?

Write a short note on annulenes.

Explain why the following systems are not aromatic?

215.

How would you convert the following compounds to benzene:
Ethyne

How would you convert the following compounds to benzene:
Ethene

How would you convert the following compounds to benzene:
Hexane

How would you convert the following compounds to benzene:
(i) Benzoic acid
(ii) Benzene diazonium chloride?

Discuss the halogenation reactions of arenes.

Discuss:
(i) nitration and  (ii) sulphonation of benzene.