What type of isomerism exists between the following pairs of compounds?
(i) Pentan-1-ol and 3-Methylbutan-1-ol
(ii) Ethanol and Dimethyl ether
(iii) Butan-1-ol and Butan-2-ol

(i) Chain isomerism (ii) Functional isomerism (iii) Position isomerism

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(i) Functional isomerism (ii) Chain isomerism (iii) Position isomerism

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(i) position isomerism (ii) Chain isomerism (Iii) Functional isomerism

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(i) Chain isomerism (ii) Position isomerism (iii) Functional isomerism

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Solution

The correct option is A (i) Chain isomerism (ii) Functional isomerism (iii) Position isomerism
(i) Pentan-1-ol and 3-Methylbutan-1-ol: Both have the same number of carbons but the length of the parent carbon chain is different. Thus the pair shows chain isomerism.

(ii) Ethanol and Dimethyl ether: Both have the same number of atoms but form two classes of functional groups of organic compounds i.e. alcohol and ether, respectively. Thus they show functional isomerism.

(iii) Butan-1-ol and Butan-2-ol: The position of the functional group in the parent chain is different. Thus shows position isomerism.

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C H_{3} - C H_{2} - O H

C H_{3} - O - C H_{3}

Positional isomerism, an example of structural isomerism, occurs when functional groups are in different positions on the same carbon chain.

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