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Q.

In which of the following molecules, the resonance effect is not present?

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a

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b

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c

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d

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answer is B.

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Detailed Solution

N+H3 group has no lone pair of electrons.The aniliniumion does not exhibit the resonance effect (protonatedaniline). A proton receives the single electron pair from N. As a result, the benzene ring and this single electron pair are not in resonance. The lone pair of electrons on the heteroatom is free to be in resonance with the benzene ring in all other situations.

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