Question

Identify the chiral molecule from the following.

Which of the following is an example of chiral molecule?

Options

• 1-Bromobutane

• 1,1-Dibromobutane

• 2,3-Dibromobutane

• 2-Bromobutane

Answer 1

2,3-Dibromobutane and 2-Bromobutane

Explanation:

At first, we need to make the structure of all compounds to say which is chiral or not.

(a) 

\[\begin{array}{cc}
\phantom{........}\ce{H}\\
\phantom{........}|\\
\ce{C - C - C - C - Br}\\
\phantom{........}|\\
\phantom{........}\ce{H}
\end{array}\]

(b)

\[\begin{array}{cc}
\phantom{.........}\ce{Br}\\
\phantom{........}|\\
\ce{C - C - C - C - Br}\\
\phantom{........}|\\
\phantom{........}\ce{H}
\end{array}\]

(c)

\[\begin{array}{cc}
\phantom{..}\ce{Br}\phantom{..}\ce{Br}\phantom{}\\
\phantom{}|\phantom{....}|\phantom{}\\
\ce{C - C - C - C}
\end{array}\]

(d)

\[\begin{array}{cc}
\phantom{......}\ce{Br}\\
\phantom{.....}|\\
\ce{C - C - C - C}\\
\phantom{.....}|\\
\phantom{.....}\ce{H}
\end{array}\]

Now, we can see that 2,3-Dibromobutane and 2-Bromobutane has a Chiral carbon (that carbon which has 4 different attachments).

Hence, It's a chiral molecule.