Class 12Chemistry8-2.Carboxylic acids and Their derivativeMix Examples-Carboxylic acids and Their derivative
MediumMatch Column-$I$ with Column-$II$ based on the $pK_a$ values of the given carboxylic acids:
Column-$I$ Column-$II$ $(A)$ $CF_3COOH$ $(i)$ $3.41$ $(B)$ Benzoic acid $(ii)$ $4.76$ $(C)$ $CH_3COOH$ $(iii)$ $0.23$ $(D)$ $4$-nitrobenzoic acid $(iv)$ $4.20$
| Column-$I$ | Column-$II$ |
| $(A)$ $CF_3COOH$ | $(i)$ $3.41$ |
| $(B)$ Benzoic acid | $(ii)$ $4.76$ |
| $(C)$ $CH_3COOH$ | $(iii)$ $0.23$ |
| $(D)$ $4$-nitrobenzoic acid | $(iv)$ $4.20$ |
(A) The $pK_a$ values for the given acids are as follows:
$(A)$ $CF_3COOH$: $0.23$ (Strongest acid due to electron-withdrawing $-F$ groups)
$(B)$ Benzoic acid: $4.20$
$(C)$ $CH_3COOH$: $4.76$ (Weakest acid)
$(D)$ $4$-nitrobenzoic acid: $3.41$ (Stronger than benzoic acid due to electron-withdrawing $-NO_2$ group)
Therefore,the correct matching is: $(A$ $\rightarrow iii), (B$ $\rightarrow iv), (C$ $\rightarrow ii), (D$ $\rightarrow i)$.
$(A)$ $CF_3COOH$: $0.23$ (Strongest acid due to electron-withdrawing $-F$ groups)
$(B)$ Benzoic acid: $4.20$
$(C)$ $CH_3COOH$: $4.76$ (Weakest acid)
$(D)$ $4$-nitrobenzoic acid: $3.41$ (Stronger than benzoic acid due to electron-withdrawing $-NO_2$ group)
Therefore,the correct matching is: $(A$ $\rightarrow iii), (B$ $\rightarrow iv), (C$ $\rightarrow ii), (D$ $\rightarrow i)$.
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MediumKVPY 2015
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