Question

A given compound satisfies one or more of the following criteria.
(A) No pi electrons are present.
(B) Pi electrons are not delocalised.
(C) The compound has non-planar structure.
What can be said about this compound?

• A. It is aromatic
• B. It is non-aromatic
• C. It is anti-aromatic
• D. Its aromatic behavior cannot be predicted

Answer 1

Answer: (B)

It is non-aromatic

If a compound is non aromatic, the following may be true.
(A) No pi electrons are present.
(B) Pi electrons are not delocalised.
(C) The compound has non planar structure.
Note:
(1) A cyclic planar compounds with a conjugated system of 4n $+$ 2 pi electrons is aromatic.
(2) A cyclic planar compounds with a conjugated system of 4n pi electrons is anti -aromatic.
All the remaining compounds are non aromatic.