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The descending order of acidity for the following carboxylic acid is- (A) CH 3 COOH (B) F 3 C - COOH (C) ClCH 2 - COOH (D) FCH 2 - COOH (E) BrCH 2 - COOH Choose the correct answer from the options given below:

Options

  1. AB > C > D > E > A
  2. BE > D > B > A > C
  3. CB > D > C > E > A
  4. DD > B > A > E > C

Correct answer

C. B > D > C > E > A

Step-by-step solution

The correct order of acidic strength of the given carboxylic acids will be decided by the stability of their conjugate bases. The + I effect of CH 3 group destabilises the carboxylate anion. But the - I effect of halogen substituted methyl group stabilises the carboxylate anion. Higher the - I effect of the halogen substituted methyl group, higher the acidic strength of the corresponding acid. ∴ Correct order of acidic strength is F 3 C - COOH  (B)  > FCH 2 - COOH  (D)  > CICH 2 -

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