Question

Which of the following is reacted with benzaldehyde to obtain 1-phenylethanol?

• A. \(\mathrm{C_6H_5MgBr}\)
• B. \(\mathrm{C_6H_5CH_2MgBr}\)
• C. \(\mathrm{CH_3MgBr}\)
• D. \(\mathrm{CH_3CH_2MgBr}\)

Hint:

Grignard reagents add to aldehydes to form secondary alcohols after acid hydrolysis.

Answer 1

The Correct Option is C

Step 1: Identify the reaction type.
The reaction involves addition of a Grignard reagent to an aldehyde.
Step 2: Analyze benzaldehyde reaction.
Benzaldehyde reacts with methyl magnesium bromide to form a secondary alcohol after hydrolysis.
Step 3: Product formation.
\[ \mathrm{C_6H_5CHO + CH_3MgBr \rightarrow C_6H_5CH(OH)CH_3} \]
Step 4: Conclusion.
Therefore, \(\mathrm{CH_3MgBr}\) reacts with benzaldehyde to give 1-phenylethanol.