Question

Optical isomerism is exhibited by ____________.

Options

• 1, 2-Dichloropropane

• 1, 1-Dichloropropane

• 2, 2-Dichloropropane

• 1, 3-Dichloropropane

Answer 1

Optical isomerism is exhibited by 1, 2-Dichloropropane.

Explanation:

1. \[\begin{array}{cc}
\ce{Cl}\phantom{..}\\
|\phantom{...}\\
\ce{H3C - C^* - CH2Cl}\\
|\phantom{...}\\
\ce{\underset{1, 2-Dichloropropane}{H}}\phantom{...}
\end{array}\]

(*C refers to asymmetric carbon, optically active)

2. \[\begin{array}{cc}
\phantom{..........}\ce{Cl}\\
\phantom{.........}|\\
\ce{H3C - CH2 - C - Cl}\\
\phantom{.........}|\\
\phantom{.........}\ce{\underset{1, 1-Dichloropropane}{H}}
\end{array}\]

(No asymmetric carbon, optically inactive)

3. \[\begin{array}{cc}
\phantom{.}\ce{Cl}\\
|\\
\ce{H3C - C - CH3}\\
|\\
\phantom{.}\ce{\underset{2, 2-Dichloropropane}{Cl}}
\end{array}\]

(No asymmetric carbon, optically inactive)

4. \[\begin{array}{cc}
\phantom{.}\ce{Cl}\phantom{.........}\ce{Cl}\phantom{}\\
\phantom{}|\phantom{...........}|\phantom{}\\
\ce{\underset{1, 3-Dichloropropane}{H2C - CH2 - CH2}}
\end{array}\]

(No asymmetric carbon, optically inactive)