Chemistry - GOC Question with Solution | TestHub

The correct order of acidic strength of the given carboxylic acids will be decided by the stability of their conjugate bases. The $+\mathrm{I}$ effect of ${\mathrm{CH}}_3$ group destabilises the carboxylate anion. But the $-\mathrm{I}$ effect of halogen substituted methyl group stabilises the carboxylate anion. Higher the $-\mathrm{I}$ effect of the halogen substituted methyl group, higher the acidic strength of the corresponding acid.
$\therefore$ Correct order of acidic strength is
${\mathrm{F}}_3\mathrm{C}-\underset{\text{ (B) }}{\mathrm{COOH}}>{\mathrm{FCH}}_2-\underset{\text{ (D) }}{\mathrm{COOH}}>\underset{\left(\mathrm{C}\right)}{{\mathrm{CICH}}_2-\mathrm{COOH}}>\underset{\left(\mathrm{E}\right)}{{\mathrm{BrCH}}_2-\mathrm{COOH}}>\underset{\left(\mathrm{A}\right)}{{\mathrm{CH}}_3-\mathrm{COOH}}$