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Question

Positional isomerism is a type of isomerism:

A
geometrical
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B
structural
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C
optical
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D
none of these
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Solution

The correct option is B structural
Positional isomerism is a type of structural isomerism. Positional isomerism is also called as regioisomerism. Positional isomers have same molecular formula, but they differ in the position of the functional group.
Thus, 1-hexanol (CH3CH2CH2CH2CH2CH2OH), 2-hexanol (CH3C|OHHCH2CH2CH2CH3) and 3-hexanol (CH3CH2C|OHHCH2CH2CH3) are positional isomers. They differ in the position of OH group.

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