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The ortho/para directing group among the...

The ortho/para directing group among the following is

A

COOH

B

CN

C

`COCH_(3)`

D

`NHCOCH_(3)`

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The correct Answer is:
D
`-COOH` and `-OH` group from the hydrogen bond bywhich they have high bonding so it form dimer andhave more boiling point than -OH group. While -CHO group do not form hydrogen bond. Thus the reactivity order are as `3 gt 1 gt 2`.
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