The decreasing order of the pKa values ...

The decreasing order of the `pK_a` values of the following compounds is:

A

B gt C gt D gt A

B

C gt B gt A gt D

C

D gt A gt C gt B

D

B gt C gt A gt D

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The correct Answer is:

C

More the acidic strength lesser will be the value of `pK_a`

is most acidic as it’s conjugate base is resonance stabilized by `NO_2` group Overall order of acidic strength

Conjugate base is destabilized by +M of –OMe, hence least acidic. Decreasing Order of pKa D > A > C > B

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