Question:
The decreasing order of acid strength of the following is}
\[
\text{FCH}_2\text{COOH,\ \ NCCH}_2\text{COOH,\ \ NO}_2\text{CH}_2\text{COOH,\ \ ClCH}_2\text{COOH}
\]
The decreasing order of acid strength of the following is}
\[
\text{FCH}_2\text{COOH,\ \ NCCH}_2\text{COOH,\ \ NO}_2\text{CH}_2\text{COOH,\ \ ClCH}_2\text{COOH}
\]
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Chemistry Tip: Stronger electron-withdrawing group near COOH means stronger acid because conjugate base becomes more stable.
Updated On: Apr 27, 2026
- FCH$_2$COOH > NCCH$_2$COOH > NO$_2$CH$_2$COOH > ClCH$_2$COOH
- NCCH$_2$COOH > NO$_2$CH$_2$COOH > FCH$_2$COOH > ClCH$_2$COOH
- NO$_2$CH$_2$COOH > NCCH$_2$COOH > FCH$_2$COOH > ClCH$_2$COOH
- NO$_2$CH$_2$COOH > FCH$_2$COOH > NCCH$_2$COOH > ClCH$_2$COOH
- ClCH$_2$COOH > FCH$_2$COOH > NCCH$_2$COOH > NO$_2$CH$_2$COOH
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
Acid strength of substituted carboxylic acids depends on the stability of the conjugate base: \[ RCH_2COOH \rightleftharpoons RCH_2COO^- + H^+ \] Electron-withdrawing groups stabilize the carboxylate ion by -I effect, increasing acidity. Stronger $-I$ effect $\Rightarrow$ stronger acid.
Step 1: Compare electron-withdrawing groups.
Given substituents:
Step 2: Apply to acids.
Therefore acidity decreases as: \[ NO_2CH_2COOH>NCCH_2COOH>FCH_2COOH>ClCH_2COOH \]
Step 3: Match option.
This exactly matches: $$\boxed{\text{Option (C)}}$$ :contentReference[oaicite:2]{index=2}
Acid strength of substituted carboxylic acids depends on the stability of the conjugate base: \[ RCH_2COOH \rightleftharpoons RCH_2COO^- + H^+ \] Electron-withdrawing groups stabilize the carboxylate ion by -I effect, increasing acidity. Stronger $-I$ effect $\Rightarrow$ stronger acid.
Step 1: Compare electron-withdrawing groups.
Given substituents:
- $-NO_2$ : very strong $-I$ effect
- $-CN$ : strong $-I$ effect
- $-F$ : strong electronegative halogen
- $-Cl$ : weaker than F
Step 2: Apply to acids.
Therefore acidity decreases as: \[ NO_2CH_2COOH>NCCH_2COOH>FCH_2COOH>ClCH_2COOH \]
Step 3: Match option.
This exactly matches: $$\boxed{\text{Option (C)}}$$ :contentReference[oaicite:2]{index=2}
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