CAIE IGCSE Chemistry 11.1.9 Homologous series features: same

Practise using the shared features of homologous series to compare members, interpret formulae and predict simple trends.

Exam points

describe adjacent members as differing by a -CH2- unit in structural or molecular formulae
use tables of boiling points or formulae to predict the next member in a homologous series

[Maximum number: 2]

Alkanes and alkenes are two homologous series of hydrocarbons.

Other than having a general formula, state two characteristics of a homologous series. 1 2

any 2 from:

- same or similar chemical properties

- (consecutive members) differ by $\mathrm{CH}_{2}$

- same functional group

- common (allow similar) methods of preparation

- physical properties vary in predictable manner/show trends/gradually change

Figure for Answer to Question 11.1.9—Homologous series features: same question 1 — CAIE IGCSE Chemistry

OR example of a physical property variation

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11.1.9—Homologous series features: same question 1