Question

Arrange the three isomers of alkanes with molecular formula C₅H₁₂ in increasing order of boiling points and write their IUPAC names.

Answer 1

The three isomers of alkane with molecular formula C₅H₁₂ are as follows:

\[\ce{\underset{n-Pentane (I)}{CH3 - CH2 - CH2 - CH2 - CH3}}\]

\[\begin{array}{cc}\ce{CH3}\phantom{......}\\
|\phantom{.........}\\
\ce{\underset{2-Methylbutane (II)}{CH3 - CH - CH2 - CH3}}
\end{array}\]

\[\begin{array}{cc}\phantom{...}\ce{CH3}\\
|\\\ce{CH3 - C - CH3}\\
|\\\phantom{...}\ce{\underset{2,2-Dimethylpropane (III)}{CH3}}
\end{array}\]

The increasing order of their boiling point is I > II > III.