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(A) The acidic strength of carboxylic acids depends on the stability of the conjugate base (carboxylate ion). Electron-withdrawing groups ($-I$ effect

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$A < B < C < D$

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(A) The acidic strength of carboxylic acids depends on the stability of the conjugate base (carboxylate ion). Electron-withdrawing groups ($-I$ effect) stabilize the carboxylate ion and increase acidity.The substituents attached to the $\alpha$-carbon are:$(A)$ $-H$ (no inductive effect)$(B)$ $-Ph$ (weak $-I$ effect)$(C)$ $-Br$ (stronger $-I$ effect)$(D)$ $-NO_2$ (strongest $-I$ effect)The order of the $-I$ effect is: $H Therefore,the increasing order of acidic strength is: $A < B < C < D$.

Arrange the following compounds in increasing order of their acidic strength:
$(A)$ $CH_3COOH$
$(B)$ $Ph-CH_2-COOH$
$(C)$ $Br-CH_2-COOH$
$(D)$ $O_2N-CH_2-COOH$

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Arrange the following compounds in decreasing order of their acidity:

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Arrange the following compounds in increasing order of their acidic strength:$(A)$ $CH_3COOH$$(B)$ $Ph-CH_2-COOH$$(C)$ $Br-CH_2-COOH$$(D)$ $O_2N-CH_2-COOH$