Question

Among the following compounds the most acidic is

• A. P- hydroxybenzoic acid
• B. P- nitrophenol
• C. P- toluic acid
• D. O- hydroxybenzoic acid

Answer 1

Answer: (D)

Acidic nature $\propto$ electron withdrawing group $\left(-I,-R\right)$ , ortho effect

Acidic nature $\propto \frac{1}{electronreleasinggroup\left(+I,+R\right)}$

A carboxylic acid is more acidic than phenol due to more stability of conjugate base.

Due to ortho effect o- hydroxyl benzoic acid is strongest acid here and correct order of decreasing of acidic nature is