You are given samples of ethane, ethene and ethyne in three different containers. How will you distinguish them?

What are aromatic hydrocarbons or arenes?

Explain isomerism in arenes.

Discuss the structure of benzene with special reference to Kekule structure. 

What do you mean by delocalisation of -electrons?

Benzene ring has three double bonds in it but is still quite stable. Explain.

Or

Why is benzene extra-ordinary stable though it contains three double bonds?

What is resonance energy?