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Q.

Which of the following is not aromatic ?

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a

Cyclopropenyl cation

b

Cycloheptatrienyl cation

c

Cyclopentadienyl cation

d

Cyclopentadienyl anion

answer is A.

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Detailed Solution

Cyclopentadienyl cation is planar and will contain a cyclic pi-electron cloud above and below the ring. However, it fails to meet the Huckel’s rule of aromaticity as it does not have (4n+2)π electrons and so it is not aromatic

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