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NEET levelSingle correct optionDifficulty 1 of 3g1032

Which of the following species is stabilised by resonance?

A $CH X_{3} - CH X_{2} - CH X_{3}$
B $CH X_{3} CH X_{2} X^{+}$
C $CH X_{3} - CH X_{3}$
D $CH X_{2} = CH - CH X_{2} X^{+}$

Answer: D

The allyl cation has an empty p orbital next to a pi bond, so the positive charge is delocalised over two carbons:

CH X_{2} = CH - CH X_{2} X^{+} X_{+} X_{2}^{2 +} CH X_{2} - CH = CH X_{2}

. The other species have no pi bond or lone pair to conjugate.

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