Question

Which of the following is/are less acidic than p-nitro-phenol?

• A. o-Nitrophenol
• B. m-Nitrophenol
• C. Phenol
• D. p-Cresol

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A o-Nitrophenol
B m-Nitrophenol
C Phenol
D p-Cresol

The acidity of phenol is enhanced by electron withdrawing substituents ortho and para to the $-OH$ group.

$\therefore$ O- Nitrophenol is more acidic than phenol.

m-nitrophenol and p-cresol.

The $p{K}_a$ values are given as,

O-Nitrophenol $-7$

P-Nitrophenol $-7$

Phenol $-10$

p-cresol $-10.3$

m-nitrophenol $-8.4$