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Which product is obtained when cyclohexanone is treated with sodium borohydride (NaBH4) in ethanol?

medium MCQ 3 marks Class 12 · Chemistry · Aldehydes Ketones and Carboxylic Acids
  1. cyclohexyl methyl ether
  2. cyclohexanol
  3. cyclohexanone
  4. cyclohexanediol
Answer
cyclohexanol

The correct answer is cyclohexanol — Thus the major product is cyclohexanol.

Step-by-step solution

  1. Recognise that NaBH4 is a mild reducing agent that selectively reduces ketones to secondary alcohols.
  2. Apply this to cyclohexanone: , where the product is cyclohexanol.
  3. Thus the major product is cyclohexanol.
Common mistake: Confusing product with a different alcohol or omitting the reduction step

Concept tested: Reduction of ketone to secondary alcohol

Published · How this solution was prepared and checked

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