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KCET2021ChemistryAldehydes and Ketones

A, B and C respectively are

Options

  1. Aethanol, ethane nitrile and ethyne
  2. Bethane nitrile, ethanol and ethyne
  3. Cethyne, ethanol and ethane nitrile
  4. Dethyne, ethane nitrile and ethanol

Correct answer

C. ethyne, ethanol and ethane nitrile

Step-by-step solution

Ethyne on reaction with HgSO ₄ / H ₂ SO ₄ gives ethanol (i.e. CH ₂= CH - OH ) which interconvert (i.e. tautomerises) to give acetaldehyde ( CH ₃ CHO ) . PCC is an oxidising agent, which oxidised the alcohol to aldehyde. Therefore, (B) is an alcohol, i.e. ethanol. CH ₃ CH ₂ OH PCC CH ₃ CHO Ethane nitrile on reaction with SnCl ₂ / HCl followed by acid hydrolysis give acetaldehyde.

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