ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Both ASSERTION $&$ REASON are correct and REASON is the correct explanation for ASSERTION

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Both ASSERTION $&$ REASON are correct but REASON is not the correct explanation for ASSERTION

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ASSERTION is correct but REASON is incorrect

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Both ASSERTION $&$ REASON are incorrect.

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Solution

The correct option is A
Both ASSERTION $&$ REASON are correct and REASON is the correct explanation for ASSERTION

Here we have alkanes that differ by one - $C H_{2}$ - (methylene) in molecular formula/weight. The subsequent homologues of alkanes differ by a - $C H_{2}$ - . Thus the reason explains the assertion, which is true.

Hence, the answer is A

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