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Questions
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
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Solution
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.
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a.
\[\begin{array}{cc}
\ce{CH3 - CH - CH2 - CH3}\\
|\phantom{.........}\\
\ce{OH}\phantom{.......}
\end{array}\]
b.
\[\begin{array}{cc}
\ce{CH3 - CH2 - CH - CH2 - CH3}\\
|\phantom{..}\\
\ce{Br}\phantom{.}
\end{array}\]
c.
\[\ce{CH3 - CH2 - CH2 - CH2Br}\]
d.
\[\begin{array}{cc}
\ce{CH3 - CH - CH3 - CH3}\\
|\phantom{.........}\\
\ce{CH3}\phantom{.......}
\end{array}\]
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a.
\[\begin{array}{cc}
\ce{CH3 - CH - CH2 - CH3}\\
|\phantom{.........}\\
\ce{OH}\phantom{.......}
\end{array}\]
b.
\[\begin{array}{cc}
\ce{CH3 - CH2 - CH - CH2 - CH3}\\
|\phantom{.}\\
\ce{Br}\phantom{.}
\end{array}\]
c.
\[\ce{CH3 - CH - CH2 - CH2Br}\]
d.
\[\begin{array}{cc}
\ce{CH3 - CH - CH2 - CH3}\\
|\phantom{.........}\\
\ce{CH3}\phantom{......}
\end{array}\]
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