Question

Which of the following compounds gives a secondary alcohol upon reaction with methylmagnesium bromide?

• A. Butyl formate
• B. 3-pentanone
• C. Pentanal
• D. Methyl butanoate

Hint:

Aldehydes react with Grignard reagents to form secondary alcohols, while ketones lead to tertiary alcohols.

Answer 1

The Correct Option is C

Methylmagnesium bromide \text{CH}_3\text{MgBr}
is a Grignard reagent that adds to carbonyl groups, forming an alcohol. In this case, pentanal, an aldehyde, will react with methylmagnesium bromide to form a secondary alcohol, while the other options will not lead to a secondary alcohol.