Which of the following groups exerts +M effect?

- O H

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- C H O

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- C O O H

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- C H_{3}

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Solution

The correct option is A $- O H$
An electron donating group or electron releasing group is an atom or functional group that donates some of its electron density into a conjugated $π$ system via resonance or inductive electron withdrawal, thus making the $π$ system more nucleophilic is called to exert $+ M$ effect. $- O H$ is an activating group exert $+ M$ effect while $- C H O a n d - C O O H$ are deactivating groups.
Methyl group is also called to be activating group due to it's $+ I$ inductive effect but it does not have any participation in conjugation, therefore, can not be considered to have $+ M$ effect.

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Similar questions

Name the functional groups present in the following compounds: [5 MARKS]

1. ${CH}_{3} - {CH}_{2} - {CH}_{2} - OH$
2. ${CH}_{3} - {CH}_{2} - {CH}_{2} - COOH$
3. ${CH}_{3} - {CH}_{2} - CHO$
4. ${CH}_{3} - CO - {CH}_{2} - {CH}_{3}$
5. ${CH}_{3} - {CH}_{2} - CO-OH$

Q. Name the functional groups present in the following compounds.
(i)

{C H}_{2} - C O - C H_{2} - {C H}_{2} - {C H}_{2} - {C H}_{3}

(ii)

{C H}_{3} - C H_{2} - {C H}_{2} - C O O H

(iii)

{C H}_{3} {- C H}_{2} - {C H}_{2} - {C H}_{2} - C H O

(iv)

{C H}_{3} - {C H}_{2} - O H

Q. Give the names of the following functional groups:
—OH, >C = O, —CHO, —COOH

Q. Write IUPAC names of the following

@CH3-CH2-CH=CH2
@CH3-CH2-CH2-C(CH3)2-CH3
@CH3-CH2-CHO
@CH3-CH(OH)-CH3
@CH3-CH2-CH2-COOH

Q. The priority of groups

O H, C O O H < C H O < O {C H}_{3}

attached to chiral carbon is in order:

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