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Arrange the following groups in order of decreasing +R (or + M) power
a) $- {OCOCH}_{3}$ b) $- {NH}_{2}$
c) – OH d) $- {NHCOCH}_{3}$

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d > c > b > a

b > c > d > a

a > d > c > b

a > c > b > d

answer is A.

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Detailed Solution

+ R effect $\Rightarrow - {NH}_{2} > - OH > - {NHCOCH}_{3} > - {OCOCH}_{3}$

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