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Question

Which of the following compound is 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
For a compound to be antiaromatic,
(i) It should be cyclic
(ii) It should be planar
(iii) It should have extended conjugation
(iv) It should have (4n) π electrons

Compound (a) is cyclic, planar and have extended conjugation with (8) π electrons. Thus, it is antiaromatic.

Compound (b) is cyclic, planar and have extended conjugation with (6) π electrons which obeys (4n+2) π electrons rule. Thus, it is aromatic in nature.
Compound (c) is non-planar so it is a non-aromatic compound.
Compound (d) is cyclic, planar and have extended conjugation with (4) π electrons. Thus, it is antiaromatic.

Option (b) is correct

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