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NEET levelSingle correct optionDifficulty 1 of 3g1063

Which of the following groups shows a -M (negative mesomeric) effect?

A $- OH$
B $- Cl$
C $- NH X_{2}$
D $- CHO$

Answer: D

A -M group withdraws pi electrons from the conjugated system. The carbonyl group of

- CHO

does this.

- NH X_{2}

,

- OH

and

- Cl

have lone pairs on the atom attached to the ring and show +M.

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