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WAEC Chemistry 2015 Paper

Question : 8

Total: 50

Which of the following pairs of compounds belongs to the same homologous series?

Solution:

Concept:

A homologous series is a family of organic compounds with the same general formula, and each member differs from the next by a

\mathrm{CH}_2

group.

Explanation:

Identify the series of each pair.

For option D, ethane,

\mathrm{C_2H_6}

, fits the alkane formula

\mathrm{C_nH_{2n+2}}

Here,

2(2) + 2 = 6

Butane,

\mathrm{C_4H_{10}}

, also fits the same alkane formula.

Here,

2(4) + 2 = 10

Both are alkanes, so they belong to the same homologous series.

Options A, B, and C contain compounds from different series, such as alkanes and alkenes.

Answer:

\mathrm{C_2H_6}

and

\mathrm{C_4H_{10}}

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