Question

A compound with molecular formula $C_4{H}_{4}O$ has all the four carbon atoms and the oxygen atom in the ring. It also has two double bonds. The compound is:

• A. homocyclic and aromatic
• B. heterocyclic and aromatic
• C. homocyclic but not aromatic
• D. heterocyclic but not aromatic

Answer 1

The correct option is B heterocyclic and aromatic

Heterocyclic - is a cyclic compound that has atoms of at least 2 different elements as members of its rings.

It is planar, cyclic, conjugated, follows Huckel's rule of $4n+2$ $\pi$ electrons.

So, $C_4{H}_{4}O$ is heterocyclic and aromatic.