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NEET levelSingle correct optionDifficulty 1 of 3g1062

Which of the following groups shows a +M (positive mesomeric) effect when attached to a benzene ring?

A $- NO X_{2}$
B $- OCH X_{3}$
C $- CHO$
D $- CN$

Answer: B

A +M group donates a lone pair into the ring. The oxygen of

- OCH X_{3}

has lone pairs, so it is +M.

- NO X_{2}

,

- CHO

and

- CN

contain multiple bonds to electronegative atoms and withdraw electrons from the ring (-M).

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