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NEET levelSingle correct optionDifficulty 1 of 3g1029

Which of the following groups shows a +M (+R) effect?

A $- NO X_{2}$
B $- CHO$
C $- COOH$
D $- NH X_{2}$

Answer: D

- NH X_{2}

has a lone pair on the atom attached to the ring and donates it by resonance (+M).

- NO X_{2}

,

- CHO

and

- COOH

withdraw electrons by resonance (-M).

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