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MHT CET202619 April 2026Morning ShiftChemistryCarboxylic Acid DerivativesActual

Which from the following is NOT a monocarboxylic acid?

Options

  1. AToluic acid
  2. BAcrylic acid
  3. CPhthalic acid
  4. DIsobutyric acid

Correct answer

C. Phthalic acid

Step-by-step solution

Toluic acid is methylbenzoic acid, which contains one -COOH group. Acrylic acid is propenoic acid ( CH₂=CH-COOH ), which contains one -COOH group. Phthalic acid is benzene-1,2-dicarboxylic acid ( C₆H₄(COOH)₂ ), which contains two -COOH groups. Thus, it is a dicarboxylic acid. Isobutyric acid is 2-methylpropanoic acid ( (CH₃)₂CH-COOH ), which contains one -COOH group. Therefore, phthalic acid is not a monocarboxylic acid. Answer: Phthalic acid

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