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JAMB Chemistry 2011 Paper

Question : 40

Total: 47

The number of isomers that can be obtained from C₄H₁₀ is

Solution:

Concept:

Structural isomers for the formula

\mathrm{C}_4\mathrm{H}_{10}

are alkanes with the same molecular formula but different carbon skeletons.

Explanation:

\mathrm{C}_4\mathrm{H}_{10}

fits the alkane formula

\mathrm{C}_n\mathrm{H}_{2n+2}

, where

n = 4

It can be arranged as a straight chain: butane,

\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3

It can also be arranged as a branched chain: 2-methylpropane,

\mathrm{CH}_3\mathrm{CH}(\mathrm{CH}_3)\mathrm{CH}_3

These are the only two possible structural isomers for

\mathrm{C}_4\mathrm{H}_{10}

Answer:

D. 2

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