Chemistry 0620 · IGCSE · Alkanes

Alkanes — practice question

This question concerns the homologous series of alkanes. Three broad features of alkanes are: • they are usually unreactive because they lack a functional group • they display patterns in physical properties, including melting points and boiling points • they possess comparable chemical properties.
(a)[2]

Describe two further general characteristics of the homologous series of alkanes.

(b(i))[1]

State the trend in the boiling points of the alkanes as the carbon chain length increases.

(b(ii))[2]

Name one other physical property of alkanes that shows a trend apart from melting points and boiling points. Describe the trend as the carbon chain length of alkanes increases.

(c)[1]

State why alkanes are described as saturated.

(d(i))[1]

State one condition needed for this substitution reaction to take place.

(d(ii))[4]

Give the structural formula and state the name of each organic product produced.

(d(iii))[1]

Define the term structural isomers.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: M1: possess a general formula of CnH2n+2

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