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MHT CET202620 April 2026Morning ShiftChemistryAlcohols Phenols and EthersActual

Which of the following on reaction with Grignard's reagent followed by hydrolysis forms tertiary alcohol ?

Options

  1. AHCHO
  2. BCH ₃ CHO
  3. CCH ₃ -CH ₂ -CHO
  4. DCH ₃ - CO - CH ₃

Correct answer

D. CH ₃ - CO - CH ₃

Step-by-step solution

Grignard reagents react with carbonyl compounds to form addition products which on hydrolysis yield alcohols. Formaldehyde ( HCHO ) reacts with Grignard reagents to form primary alcohols. Other aldehydes (such as CH ₃ CHO and CH ₃ -CH ₂ -CHO ) react with Grignard reagents to form secondary alcohols. Ketones (such as CH ₃ - CO - CH ₃ ) react with Grignard reagents to form tertiary alcohols. The reaction proceeds as follows: CH ₃ - CO - CH ₃ + RMgX CH ₃ - C ( R )( OMgX ) - CH ₃ CH ₃ - C ( R )( OMgX ) - CH ₃ + H ₂ O C

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