Which of the following pairs are not isomers ?

n-butane and iso-butane

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n-pentane and neo-pentane

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1-butyne and 2-butyne

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Propane and methyl propane

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Solution

The correct option is D
Propane and methyl propane

Propane is $C_{3} H_{8}$ whereas methyl propane is $C_{4} H_{10}$ . Thus, they are not isomers and they have different molecular formulas.

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Which of the following pairs of compounds are not positional isomers?

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