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MHT CET202619 April 2026Morning ShiftChemistryAlcohols Phenols and EthersActual

Identify the compound obtained when ethyl methyl ketone is treated with CH ₃ MgBr and hydrolyzed.

Options

  1. A( CH ₃)₃ C - OH
  2. BC ₂ H ₅ - CH ₃ | CH ₃ | C - OH
  3. C( C ₂ H ₅)₃ , C - OH
  4. DCH ₃ - C ₂ H ₅ | C ₂ H ₅ | C - OH

Correct answer

B. C ₂ H ₅ - CH ₃ | CH ₃ | C - OH

Step-by-step solution

Ethyl methyl ketone is CH ₃- CO - C ₂ H ₅ . When it reacts with the Grignard reagent CH ₃ MgBr , the nucleophilic methyl group attacks the electrophilic carbonyl carbon to form an intermediate alkoxide. CH ₃- CO - C ₂ H ₅ + CH ₃ MgBr CH ₃- C ( OMgBr )( CH ₃)- C ₂ H ₅ Upon hydrolysis, the alkoxide is protonated to yield a tertiary alcohol. CH ₃- C ( OMgBr )( CH ₃)- C ₂ H ₅ H ₂ O C ₂ H ₅- C ( CH ₃)₂- OH + Mg ( OH ) Br The final product is 2-methylbutan-2-ol, which matches the structure C ₂ H ₅ - CH ₃ | CH ₃ | C - OH

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