Question

Which of the following is a mixed ketone?

Options

• Pentan-3-one

• Acetone

• Benzophenone

• Butanone

Answer 1

Butanone

Explanation:

Both alkyl and aryl groups linked to carbonyl carbon are identical in simple ketones. The two alkyl or aryl groups linked to the carbonyl carbon differ in mixed ketones.

1. \[\begin{array}{cc}
\ce{O}\phantom{..}\\
||\phantom{..}\\
\ce{\underset{Pentan-3-one (simple or symmetrical ketone)}{CH3 - CH2 - C - CH2 - CH3}}
\end{array}\]

2. \[\begin{array}{cc}
\ce{O}\phantom{.}\\
||\phantom{.}\\
\ce{\underset{Acetone (simple or symmetrical ketone)}{CH3 - C - CH3}}
\end{array}\]

3. \[\begin{array}{cc}
\ce{O}\phantom{..}\\
||\phantom{..}\\
\ce{\underset{Benzophenone (simple or symmetrical ketone)}{C6H5 - C - C6H5}}
\end{array}\]

4. \[\begin{array}{cc}
\ce{O}\phantom{........}\\
||\phantom{........}\\
\ce{\underset{Butanone (mixed or unsymmetrical ketone)}{CH3 - C - CH2 - CH3}}
\end{array}\]