Question

Order of $K _{ a _{1}} \& K _{ a _{2}}$ in the following carboxylic acids:

• A. $K _{ a _{1}}= I > II > III > IV$ $K _{ a _{2}}= I > II > III > IV$
• B. $K_{a_{1}}=I V>I I I>I I>I$ $K _{ a _{2}}= I > II > III > IV$
• C. $K_{a_{1}}=I I>I I I>I V>I$ $K _{ a _{2}}^{ a }= I > IV > III > II$
• D. $K_{a_{1}}=I I>I V>I>$ III $K _{ a _{2}}^{ T }= I > III > IV > II$

Answer 1

Answer: (B)

In $K _{ a }$, Acidic strength depends upon $-I $ effect of $- COOH$ group In $K _{ a }$ Acidic strength depends upon $+ I$ effect of $- COO$ group after removal of $H ^{+}$