The decreasing order of + R power of the given groups is:
1) $- O^{-}$ 2) $- N H_{2}$ 3) $- O H$ 4) $- N H C O C H_{3}$

1 > 2 > 3 > 4

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1 > 3 > 4 > 2

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1 > 4 > 2 > 3

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1 > 4 > 3 > 2

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Solution

The correct option is C $1 > 4 > 2 > 3$
The decreasing order of $+ R$ power of the given groups is:
$1 > 3 > 2 > 4$ or $- O > - O H > - N H_{2} > - N H C O C H_{3}$
$- N H C O C H_{3}$ group has minimum value or $+ R$ effect as the lone pair of electrons on $N$ atom is involved in resonance with carbonyl group. $- O$ has maximum $+ R$ effect as $O$ is highly electronegative element.

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The decreasing order of + R power of the given groups is:1)−O− 2)−NH2 3)−OH 4)−NHCOCH3

The decreasing order of + R power of the given groups is:
1) $- O^{-}$ 2) $- N H_{2}$ 3) $- O H$ 4) $- N H C O C H_{3}$