Atoms, molecules and stoichiometry — Chemistry 9701 AS & A Level Question & Worked Solution

Three structural isomers have the formula $\text{C}_5\text{H}_{12}$. Which formulae correctly show these three structural isomers?

A$\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_3$, $\text{CH}_3\text{CH}_2\text{CHCH}_3\text{CH}_3$, $\text{CH}_3\text{CH}_3\text{CCH}_3\text{CH}_3$
B$\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_3$, $\text{CH}_3\text{CH}_2\text{CH(CH}_3)\text{CH}_3$, $\text{C(CH}_3)_4$
C$\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_3$, $\text{CH}_3\text{CH(CH}_3)\text{CH}_2\text{CH}_3$, $\text{CH}_3\text{C(CH}_3)_2\text{CH}_3$
D$\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_3$, $\text{CH}_3\text{CH(CH}_3)\text{CH}_2\text{CH}_3$, $\text{CH}_3\text{CH}_2\text{CH(CH}_3)\text{CH}_3$

Atoms, molecules and stoichiometry — practice question