Which of these species is/are aromatic?

I

only

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I I

only

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I I I

only

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Both

I I

and

I I I

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Solution

The correct option is D Both $I I$ and $I I I$
Both $I I$ and $I I I$ follow Huckle's rule of (4n+2) delocalised pi electrons for n = 0 and n = 1 respectively, while in the first structure there are only 4 pi electrons. Thus structure $I$ is not aromatic.

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