n-Butane and isobutane are:

same compound

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allotropes

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isomers

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structural isomers

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Solution

The correct option is D structural isomers
n-butane and isobutane are the structural isomers which have the same molecular formula but have a different order in which they are put together. With the structural formula of butane, there are two different isomers possible.
structure of n-butane
$C H_{3} - C H_{2} - C H_{2} - C H_{3}$
Structure of isobutane
$C H_{3} - C H (C H_{3}) - C H_{3}$

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