The correct order of pK a values for the following compounds is:

Question

The correct order of pK a values for the following compounds is: (A) a>b>c>d (B) b > a > d > c (C) b > d > a > c (D) c > a > d > b

Tardigrade Admin · Accepted Answer

Due to - M effect of - NO 2 group, it increases acidity + M effect of N ( CH 3)2 decreases acidity. Hyperconjugation of isopropyl decrease acidity ∴ order of acidic strength (c) > (a) > (d) > (b)

Q. The correct order of $p K_{a}$ values for the following compounds is:

$a > b > c > d$

$b > a > d > c$

$b > d > a > c$

$c > a > d > b$

Due to $- M$ effect of $- N O_{2}$ group, it increases acidity $+ M$ effect of $N (C H_{3})_{2}$ decreases acidity.
Hyperconjugation of isopropyl decrease acidity
$∴$ order of acidic strength
(c) $>$ (a) $>$ (d) $>$ (b)

Q. The correct order of pKa​ values for the following compounds is:

a>b>c>d

b>a>d>c

b>d>a>c

c>a>d>b