Q.

Which of the following molecules is least resonance stabilized?

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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 D.

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Detailed Solution

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Aromatic compounds are stable due to resonance while non-aromatics are not. According to Huckl’s rule (or 4n + 2 rule), “For a planar, cyclic compounds to be aromatic its π cloud must contain (4n + 2) π electrons, where, n is any whole number. “Thus,
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Above given compounds are aromatic and stabilized by resonance. They follow Huckel’s rule
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is non-aromatic, hence, least stabilised by resonance.

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