JEE PYQ: General Organic Chemistry Question 44
Question 44 - 2019 (10 Jan Shift 1)
The increasing order of the $pK_a$ values of the following compounds is:
A: Phenol B: $o$-Nitrophenol C: $p$-Nitrophenol D: $p$-Methoxyphenol
(1) C < B < A < D
(2) B < C < D < A
(3) D < A < C < B
(4) B < C < A < D
Show Answer
Answer: (4)
Solution
Electron withdrawing substituents increase the acidic strength while electron releasing groups decrease the acidic strength. $\therefore$ Acidic strength $\propto K_a \propto \frac{1}{pK_a}$. So $pK_a$: B < C < A < D.
BETA
