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NEET2007ChemistryGeneral Organic ChemistryActual

Which of the following represents the correct order of the acidity in the given compounds?

Options

  1. AFCH ₂ COOH > CH ₂ COOH > BrCH ₂ COOH > ClCH ₂ COOH
  2. BBrCH ₂ COOH > ClCH ₂ COOH > FCH ₂ COOH > CH ₃ COOH
  3. CFCH ₂ COOH > ClCH ₂ COOH > BrCH ₂^2 COOH > CH ₃ COOH
  4. DCH ₃ COOH > BrCH ₂ COOH > ClCH ₂ COOH > FCH ₂ COOH

Correct answer

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

Step-by-step solution

Electron withdrawing substituent increases the acidity by increasing the ionic character of - OH by inductive effect. Electronegativity decreases in the order. F > Cl > Br -I effect also decreases in the same order. Thus, the correct sequence is aligned & FCH ₂ COOH > ClCH ₂ COOH > & BrCH ₂ COOH > CH ₃ COOH aligned Related Theory I effect is a permanent effect & generally represented by an arrow on the bond.

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