Which of the following group show +m effect?

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−CN

−CCl3

−CHO

answer is B.

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Detailed Solution

The groups having lone pair of electrons to donate and after donation it must have 8 shared pair of electron with positive charge on it, can show +M effect.From the given options, only NO have lone pair of electron where as in rest of the options bond connectivity is through C atom, which does not have lone pair of electron.

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