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JEE Main20199 Jan 2019Morning ShiftChemistryCarboxylic Acid DerivativesActual

Acid strength given below the correct decreasing order will be :

Options

  1. ANO 2 CH 2 COOH > FCH 2 COOH > CNCH 2 COOH > ClCH 2 COOH
  2. BNO 2 CH 2 COOH > NCCH 2 COOH > FCH 2 COOH > ClCH 2 COOH
  3. C  CNCH 2 COOH > O 2 NCH 2 COOH > FCH 2 COOH > ClCH 2 COOH
  4. DFCH 2 COOH > NCCH 2 COOH > NO 2 CH 2 COOH > ClCH 2 COOH

Correct answer

B. NO 2 CH 2 COOH > NCCH 2 COOH > FCH 2 COOH > ClCH 2 COOH

Step-by-step solution

Acidic character α stability of conjugate base (anion) Stability of anion α – I Hence greater the – I effect greater will be the acidity Order of -I-effect - NO 2 > CN > - F > - Cl Hence, order of acidity will be O 2 NCH 2 COOH > NC   CH 2 COOH > FCH 2   COOH > Cl   CH 2   COOH                                 

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