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MHT CET Medical202621 April 2026Evening ShiftChemistryAldehydes and KetonesActual

Which of the following compounds will not undergo aldol condensation?

Options

  1. ACH ₃ -CHO (Acetaldehyde)
  2. BCH ₃ -CO-CH ₃ (Acetone)
  3. CC ₆ H ₅ -CHO (Benzaldehyde)
  4. DCH ₃ -CH ₂ -CHO (Propionaldehyde)

Correct answer

C. C ₆ H ₅ -CHO (Benzaldehyde)

Step-by-step solution

Aldol condensation is given by aldehydes and ketones containing at least one -hydrogen atom. Acetaldehyde ( CH ₃ -CHO ) has three -hydrogen atoms. Acetone ( CH ₃ -CO-CH ₃ ) has six -hydrogen atoms. Propionaldehyde ( CH ₃ -CH ₂ -CHO ) has two -hydrogen atoms. Benzaldehyde ( C ₆ H ₅ -CHO ) does not have any -hydrogen atom. Therefore, benzaldehyde will not undergo aldol condensation. Answer: C ₆ H ₅ -CHO (Benzaldehyde)

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