Question

Identify A in the following reaction.

\[\ce{A + CH3MgBr ->[Ether] complex ->[H3O+] (CH3)3C - OH}\]

Options

• Acetone

• Propionaldehyde

• Acetaldehyde

• Acetyl chloride

Answer 1

Acetone

Explanation:

Acetone (CH₃COCH₃) reacts with methyl magnesium bromide to produce a magnesium hydroxy bromide complex, which is then hydrolyzed to produce tertiary alcohol.

\[\begin{array}{cc}
\phantom{.......}\ce{O}\phantom{..................................}\ce{OMgBr}\phantom{.......................}\\
||\phantom{...................................}|\phantom{.......................}\\
\ce{CH3 \underset{\text{[A]}}{\underset{\text{Acetone}}{- C -}} CH3 + CH3MgBr ->[Ether] H3C - C - CH3 ->[H3O+] \underset{\text{3° alcohol}}{(CH3)3 C} - OH}\\
\phantom{..............}|\\
\phantom{...................}\ce{\underset{\text{Complex}}{CH3}}
\end{array}\]