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MHT CET Medical202621 April 2026Morning ShiftChemistryGeneral Organic ChemistryActual

Which of the following is a gas at room temperature ?

Options

  1. APropanal
  2. BAcetaldehyde
  3. CFormaldehyde
  4. DAcetone

Correct answer

C. Formaldehyde

Step-by-step solution

Methanal (formaldehyde) is a gas at room temperature. Ethanal (acetaldehyde) is a volatile liquid, while other aldehydes and ketones are liquids or solids at room temperature. Therefore, formaldehyde is the only gas among the given options. Answer: Formaldehyde

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