Chemistry 9701 · AS & A Level · An introduction to AS Level organic chemistry

An introduction to AS Level organic chemistry — practice question

These compounds were identified as components in a petrol sample. G: $\text{CH}_3(\text{CH}_2)_2\text{CH}_3$, H: $(\text{CH}_3)_3\text{CCH}_2\text{CH}(\text{CH}_3)_2$, J: a displayed alcohol structure.
(a(i))[1]

Give the molecular formula for compound G.

(a(ii))[1]

Give the empirical formula for compound H.

(a(iii))[1]

Draw the skeletal formula for compound J.

(b)[1]

Write an equation that represents the complete combustion of compound H.

(c)[2]

Fossil fuels are often contaminated with sulfur. State and explain why fossil fuel supplies that contain sulfur are an environmental problem.

(d)[4]

The boiling points listed for compounds G, H and J are G, $0\,^{\circ}\text{C}$; H, $99\,^{\circ}\text{C}$; J, $112\,^{\circ}\text{C}$. Explain why the boiling points of the three compounds are different.

(e)[1]

Compound J may be made from 2-chloro-3-methylbutane, $\text{C}_5\text{H}_{11}\text{Cl}$. Give the reagent(s) and conditions for this reaction.

Worked solution & mark scheme

This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: Molecular formula = $\ce{C4H10}$

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