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Question

Which of the following compound is non aromatic:

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
In option (a), the structure is cyclic, planar, 6 electron's system (4πe s+2e from only one lone pair)(only one lone pair required for delocalisation). It follows (4n+2) rule (n=2). 4πe s and 2e from lone pair are in complete delocalisation or in resonance, hence aromatic.

In option(b), the structure is cyclic, planar, 6πe s system but not in conjugation, hence non-aromatic.

In option(c), the structure is cyclic, planar, 6e s system (4πe s+2e from one negative charge) follows (4n+2) rule, hence aromatic.

In option(d), the structure is cyclic, planar 2πe s follows (4n+2) rule, hence aromatic.

So the correct answer is option(b).

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