Question

An organic compound X(molecular formula C6H7O2N) has six carbon atoms in a ring system, two double bonds and a nitro group as substituent, X is

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

Answer 1

Answer: (A)

homocyclic but not aromatic

Answer 2

For a compound to be aromatic, it must have $(4 n+2) \pi$ 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, $C _{6} H _{7} NO _{2}$ is homocyclic but not aromatic.