Chemistry 9701 · AS & A Level · Hydrocarbons

Hydrocarbons — practice question

Chemical tests can be used to tell organic compounds apart. Table 4.1 presents four pairs of compounds.
(a)[8]

Complete Table 4.1 in order to: • identify a reagent that can distinguish the members of each pair • state the positive outcome of the chemical test and say which compound shows it. Use a different reagent for every test.

(b)[2]

$C1$ melts at $-94\,^{\circ}\text{C}$ and boils at $+49\,^{\circ}\text{C}$. Explain these values in terms of the van der Waals’ forces acting between the molecules.

(c)[1]

Draw the structure for the cis isomer of C2.

(d(i))[1]

When C2 is heated gently, it forms a polymer. Identify the type of polymer produced from C2.

(d(ii))[2]

Draw one repeat unit of the polymer formed from C2.

Worked solution & mark scheme

This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: Correct pairing of reagent and observation, for example $\text{K}_2\text{Cr}_2\text{O}_7$ changes the solution from orange to green

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