The group has $+ R$ and $- I$ effects are:

C H O

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- O H

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N C

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C N

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Solution

The correct option is A $C H O$
In $C H O$ group, the transfer of an electron from an atom attached to a conjugated system so it is $+ R$ effect.
$C H O$ has an electron withdrawing nature of groups so it shows $- I$ effect.
Hence answer is option A

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Similar questions

The group that exhibits +R effect when attached to benzene ring is

+ R

- I

- C O O H, - C N, - N H_{2} - C O C H_{3}, - N H C O C H_{3}, - O H, - C H O, - S O_{3} H, - C l, - N O_{2}

- N C

- C N

R - C N (i) S n C l_{2} + H C l - -------- \to (i i) H_{3} O^{+} R - C H O

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