Question

Write structures of different dihalogen derivatives of propane.

Answer 1

Four isomeric dihalogen derivatives of propane (CH₃ CH₂ CH₃) are possible.

\[\ce{\underset{1, 3-dibromopropane}{BrCH2 - CH2 - CH2Br}}\]

\[\begin{array}{cc}
\ce{BrCH2 - CH - CH3}\\
|\\
\phantom{.}\ce{\underset{1, 2-dibromopropane}{Br}}
\end{array}\]

\[\begin{array}{cc}
\ce{Br - CH - CH2 - CH3}\\
|\phantom{...........}\\
\ce{\underset{1, 1-dibromopropane}{Br}}\phantom{..........}
\end{array}\]

\[\begin{array}{cc}
\ce{CH3 - C - CH3}\\
/\phantom{.}\backslash\\
\phantom{..}\ce{\underset{2, 2-dibromopropane}{Br\phantom{..}Br}}
\end{array}\]

Answer 2

The structures of all possible dihalogen derivatives of propane are:

\[\ce{\underset{1, 3-dihalopropane}{X - CH2 - CH2 - CH2 - X}}\]

\[\begin{array}{cc}
\ce{X}\phantom{.......}\\
|\phantom{.......}\\
\ce{\underset{1, 2-dihalopropane}{H3C - CH - CH2 - X}}\
\end{array}\]

\[\begin{array}{cc}
\ce{X}\\
|\\
\ce{H3C - C  - CH2}\\
|\\
\ce{\underset{2, 2-dihalopropane}{X}}\\
\end{array}\]

\[\begin{array}{cc}
\phantom{.............}\ce{X}\\
\phantom{.............}|\\
\ce{H3C - CH2 - CH}\\
\phantom{.............}|\\
\phantom{.............}\ce{\underset{1, 1-dihalopropane}{X}}\\
\end{array}\]