(D) Acidic strength is directly proportional to the electron-withdrawing effect ($-I$ effect) of the substituent group attached to the $\alpha$-carbon

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$NO_2CH_2COOH > NCCH_2COOH > FCH_2COOH > ClCH_2COOH$

(D) Acidic strength is directly proportional to the electron-withdrawing effect ($-I$ effect) of the substituent group attached to the $\alpha$-carbon of the carboxylic acid. The strength of the $-I$ effect follows the order: $NO_2 > CN > F > Cl$. Therefore,the correct decreasing order of acidic strength is $NO_2CH_2COOH > NCCH_2COOH > FCH_2COOH > ClCH_2COOH$.

Class 12 Chemistry 8-2.Carboxylic acids and Their derivative Properties of Carboxylic Acids and Their Derivatives

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The correct decreasing order for acidic strength is

JEE MAIN 2019 All JEE MAIN

A
$NO_2CH_2COOH > FCH_2COOH > CNCH_2COOH > ClCH_2COOH$
B
$FCH_2COOH > NCCH_2COOH > NO_2CH_2COOH > ClCH_2COOH$
C
$CNCH_2COOH > O_2NCH_2COOH > FCH_2COOH > ClCH_2COOH$
D
$NO_2CH_2COOH > NCCH_2COOH > FCH_2COOH > ClCH_2COOH$

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8-2.Carboxylic acids and Their derivative

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Properties of Carboxylic Acids and Their Derivatives

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The correct decreasing order for acidic strength is

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Identify the correct decreasing order of acidic strength for the following compounds:
$I$: $p$-Nitrobenzoic acid
$II$: Benzoic acid
$III$: $p$-Methoxybenzoic acid