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Question

Which of the following is anti-aromatic in nature?

A
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B
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C
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D
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Solution

The correct option is B
(a) Cyclooctatetraene is a cyclic, non-planar (tub-shape) molecule having 8 π-electrons. Therefore, it is a non-aromatic compound.

(b) Cyclopentadienyl cation is a cyclic, planar molecule having 4 π-electrons. Therefore, it is an anti-aromatic compound.

(c) Cyclopentadiene is a cyclic, non-planar molecule due to the sp3 C atom. Therefore, it is a non-aromatic compound.

(d) [10]-Annulene is a cyclic, non-planar molecule having 10 π-electrons. Therefore, it is a non-aromatic compound.

Hence, option (b) is the correct answer.

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