Q45 / 66 · NTA Abhyas (JEE Main) 2020 · Chemistry · Carboxylic Acid Derivatives

The correct order of acidic strength of the following is
(I) Oxalic acid HOOC-COOH
(II) Malonic acid HOOC-CH2-COOH
(III) Succinic acid HOOC-CH22-COOH
(IV) Glutaric acid HOOC-CH23-COOH

  • Correct answer
    A
    I > II > III > IV
  • B
    I > III> II > IV
  • C
    IV> III > II > I
  • D
    IV> II > III > I

Solution

Acidic strength of dicarboxylic acid is based on the +I effect of alkyl group. As +I increases acidic nature decreases.
Compounds with formula HOOC-CH2n-COOH are called dicarboxylic acid.
Acidic strength order is:
Oxalic acid > Malonic acid > Succinic acid > Glutaric acid

Hence, the correct answer is option: 'A'.

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