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COMEDK2015ChemistryCarboxylic Acid Derivatives

Which of the following is the correct sequence of relative acidic strength?

Options

  1. AFCH ₂ COOH > ClCH ₂ COOH > BrCH ₂ COOH
  2. BClCH ₂ COOH > BrCH ₂ COOH > FCH ₂ COOH
  3. CBrCH ₂ COOH > ClCH ₂ COOH > FCH ₂ COOH
  4. DClCH ₂ COOH > FCH ₂ COOH > BrCH ₂ COOH

Correct answer

A. FCH ₂ COOH > ClCH ₂ COOH > BrCH ₂ COOH

Step-by-step solution

Acid strength increases as the electronegativity of halogen increases because the anion formed after H ⁺ ion release, is stabilised by -I -effect. The order of - I -effect is F > Cl > Br > I . Order of acidic strength is as follows : FCH ₂ COOH > ClCH ₂ COOH > BrCH ₂ COOH

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