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Question

Which of the following lone-pair indicated is not involved in resonance?
(A) $$CH_{2} = CH - \overset {..}{N} H - CH_{3}$$
(B) $$CH_{2} = CH -  \underset {..}{\overset {..}{O}}-CH_3$$
(C) $$CH_{2} = CH - \underset {..}{\overset {..}{O}} - CH = CH_{2}$$
(D) $$CH_{2} = CH - NH_2$$
773214_9279c32d79ca4753a2e045e66ccf5a79.png


Solution


For resonance, there should be alternate lone pair as well as $$\pi-$$bond / or $$(\sigma-/\pi-)$$ alternate.

While compound A,B,C and D there is lone pair and double bond in conjugation so lone pair involve in resonnace.

1174917_773214_ans_511b2fd009404184ab00c42bb3a9044a.png

Chemistry

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