Question

An organic compound $X$ (molecular formula $C_6{H}_7{O}_{2}N$) has six carbon atoms in a ring system having two double bonds and a nitro group as a substituent. The compound $X$ is:

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

Answer 1

Answer: (A)

homocyclic but not aromatic

For a compound to be aromatic, it must have $(4n+2)\pi$ electrons.

Here two double bonds are present, $4\pi$ electrons are present in the compound.

Therefore, it is anti-aromatic.

Homocyclic compounds are ring structures that consist only of carbon atoms within the ring. A nitro group is attached to the ring system as a substituent, so, $C_6{H}_{7}N{O}_2$ is homocyclic but not aromatic.

Hence, option $A$ is correct.