Assertion (A): Carboxylic acids do not give the characteristic...

Carboxylic acids do not undergo characteristic nucleophilic addition reactions like aldehydes and ketones because the lone pair of electrons on the oxygen atom of the $-\text{OH}$ group is involved in resonance with the carbonyl group. This resonance delocalizes the electron density, making the carbonyl carbon less electrophilic (less electron-deficient) compared to the carbonyl carbon in aldehydes and ketones.

Therefore, Assertion (A) is true, but Reason (R) is false because the carbonyl carbon of carboxylic acids is less electrophilic, not more, and this is due to the resonance effect ($+\text{R}$), not just the inductive effect.

Answer: Assertion (A) is true but Reason (R) is false