Question

Draw all structural isomers of hydrocarbon having the molecular formula C₅H₁₂. Also give their IUPAC names.

Answer 1

1. Pentane (n-Pentane)

\[ \text{CH}_3 - \text{CH}_2 - \text{CH}_2 - \text{CH}_2 - \text{CH}_3 \]

2. 2-Methylbutane (Isopentane)

\[ \text{CH}_3 - \text{CH}_2 - \underset{\substack{\textstyle | \\[-0.2ex] \textstyle \text{C}\rlap{\text{H}_3}}}{\text{C}}\text{H} - \text{CH}_3 \]

3. 2,2-Dimethylpropane (Neopentane)

\[ \text{CH}_3 - \overset{\substack{\textstyle \text{C}\rlap{\text{H}_3} \\[-0.2ex] \textstyle |}}{\underset{\substack{\textstyle | \\[-0.2ex] \textstyle \text{C}\rlap{\text{H}_3}}}{\text{C}}} - \text{CH}_3 \]