Chemistry - GOC Question with Solution | TestHub

Question Explanation: Matching the compounds (Column-I) with their approximate ${\mathrm{pK}}_{\mathrm{a}1}$ values (Column-II).

Concept: Acidity $\left({\mathrm{pK}}_{\mathrm{a}}\right)$ of Carboxylic Acids Solution: Acidity $\propto$ EWG. Lowest ${\mathrm{pK}}_{\mathrm{a}}⟹$ Strongest acid.

Acidity Order: B( Diacid) > C (Cl) > A (Acetic) > D (Propanoic).

B (Oxalic acid) →1.2 (S).

C (Chloroacetic acid) → 2.86 (R).

A (Acetic acid) → 4.76 (Q).

D (Propanoic acid) → 4.87 (P).