Chemistry 0620 · IGCSE · Alkenes

Alkenes — practice question

Two compounds, A and B, have the structural formulae shown below. A: CH₂=CHCH₃ B: CH₃CH=CHCH₃ A and B belong to one homologous series.
(a)[2]

State two ways in which the structural formulae of A and B indicate that they are members of the same homologous series.

(b)[1]

Explain why A and B can both be described as hydrocarbons.

(c)[2]

State the symbol equation for the complete combustion of A.

(d)[1]

Deduce the empirical formula for A.

(e)[1]

Name the compound B.

(f)[1]

B has a structural isomer that is still in the same homologous series. Draw the displayed formula of this structural isomer of B.

(g(i))[1]

State why this reaction is an addition reaction.

(g(ii))[1]

Describe the colour change in aqueous bromine as this reaction proceeds. from ……… to ………

(g(iii))[1]

Name the product C.

(h(i))[1]

Draw the displayed formula for carboxylic acid D.

(h(ii))[1]

Name the carboxylic acid D.

(h(iii))[1]

Complete the symbol equation shown for this reaction. $\text{CH}_3\text{CH}=\text{CHCH}_3 + …………… → ……………$

Worked solution & mark scheme

This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: General formula: CnH2n

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