Assertion(A): Electron withdrawing group increases acidic nature of the carboxylic acid

Reason(R): Phenolate ion is stabilized by resonance.

More is the electron withdrawing group, more easily carboxylic acid can release its acidic proton and thus, enhances the acidic nature of carboxylic acid. Phenolate ion is produced when phenol releases its acidic proton and this ion is stabilized by resonance.

Both Assertion and Reason are true but Reason and assertion has no connection with each other.