Chemistry - GOC Question with Solution | TestHub

${\mathrm{K}}_{\mathrm{a}}\propto$stability of phenoxide ion$\propto$dispersal of –ve charge
$\mathrm{p}{\mathrm{K}}_{\mathrm{a}}\propto \frac{1}{{\mathrm{K}}_{\mathrm{a}}}$

Stability of phenoxide ion$=$b > c > a > d
${\mathrm{K}}_{\mathrm{a}}=$B > C > A > D
Hence values of$\text{p}{\text{K}}_{\mathrm{a}}$in increasing order are B < C < A < D.