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MHT CET202615 April 2026Evening ShiftChemistryCarboxylic Acid DerivativesActual

Which of the following is the strongest carboxylic acid?

Options

  1. ACH ₃ COOH
  2. BHCOOH
  3. CCH ₃ CH ₂ -COOH
  4. DClCH ₂ COOH

Correct answer

D. ClCH ₂ COOH

Step-by-step solution

The acidic strength of carboxylic acids depends on the stability of the conjugate base (carboxylate ion). Electron-withdrawing groups (EWG) stabilize the conjugate base through the -I effect, thereby increasing the acidic strength. Electron-donating groups (EDG) destabilize the conjugate base through the +I effect, decreasing the acidic strength. In the given options: ClCH ₂ COOH has a - Cl group which exerts a strong -I effect. HCOOH has a hydrogen atom (reference for I effect). CH ₃ COOH has a - CH ₃ group which

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