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MHT CET202613 April 2026Evening ShiftChemistryCarboxylic Acid DerivativesActual

Which is a weakest acid among the following ?

Options

  1. A( CH ₃)₂ CHCOOH
  2. BCH ₃ COOH
  3. CClCH ₂ COOH
  4. DCl ₃ CCOOH

Correct answer

A. ( CH ₃)₂ CHCOOH

Step-by-step solution

Acidic strength is directly proportional to the stability of the conjugate base. Electron-withdrawing groups ( -I effect) stabilize the carboxylate ion and increase acidic strength, while electron-donating groups ( +I effect) destabilize the carboxylate ion and decrease acidic strength. The +I effect of the isopropyl group ( CH ₃)₂ CH - is greater than that of the methyl group CH ₃- . Chlorine atoms exert a -I effect, which increases acidic strength. Thus, Cl ₃ CCOOH and ClCH ₂ COOH are stronger acids. Since ( CH ₃

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