Which compound(s) out of the following is/are not aromatic?

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C and D

B, C and D

A and C

answer is B.

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Detailed Solution

Aromatic compounds are planar structure, cyclic, complete conjugated system (electron delocalisation) and follows Huckel rule (4n+2) n=0,1,2,3...
In compounds if there is odd no. of pi bonds then it is aromatic.
Anti-aromatic compounds have planar structure, cyclic, conjugation, does not follow huckel rule. It follows (4n) rule.
Cyclopropenyl cation follow (4n+2) rule: aromatic.
Cyclopentadienyl cation follow(4n) rule: anti-aromatic.
Cycloheptatrienyl anion follow (4n) rule: antiaromatic
Cycloheptatrienyl do not follow huckel rule : non-aromatic.

Hence, the correct option is: (B) B,C and D.

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