Question

Match the following pKa values:

Acid		pKa
(a)	Phenol	(1)	16
(b)	p-Nitrophenol	(2)	0.78
(c)	Ethanol	(3)	10
(d)	Picric acid	(4)	7.1

• A. a -> 3, b -> 1, c -> 4, d -> 2
• B. a -> 4, b -> 2, c -> 3, d -> 1
• C. a -> 3, b -> 4, c -> 1, d -> 2
• D. a -> 2, b -> i, c -> 2, d -> 4

Answer 1

Answer: (C)

Presence of nitro group (EWG) increases the acidic strength, and picric acid is trinitrophenol.