Acid strength given below the correct decreasing order will be :

Acid strength given below the correct decreasing order will be :

  1. NO2CH2COOH>FCH2COOH>CNCH2COOH>ClCH2COOH
  2. NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH
  3.  CNCH2COOH>O2NCH2COOH>FCH2COOH>ClCH2COOH
  4. FCH2COOH>NCCH2COOH>NO2CH2COOH>ClCH2COOH

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 -NO2>CN>-F>-Cl Hence, order of acidity  will be

O2NCH2COOH>NC CH2COOH>FCH2 COOH>Cl CH2 COOH                      

Asked in: JEE Main 2019 (09 Jan Shift 1)

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