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Arrange the following compounds in order...

Arrange the following compounds in order of decreasing acidic strength.

A

`I gt II gt III gt IV`

B

`III gt I gt II gt IV`

C

`I gt III gt II gt IV`

D

`II gt IV gt I gt III`

Text Solution

Verified by Experts

The correct Answer is:
C
`(I)` and `(II)` have close `pK_(a)` values as the steric effect is absent, `(II)` being slightly weaker due to the `+I` effect of the two `o-Me` groups. In `(III)` , the electron releasing effect inbition of resonance of `NO_(2)`.Thus `(IV)` is much weaker than `(I)` . The correct order of acid strength is
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