Assertion :Boiling point of hexane is greater than that of pentane. Reason: n-Alkanes have higher boiling points than isoalkanes.

If both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion.

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If both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion.

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If assertion is CORRECT, but reason is INCORRECT.

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If assertion is INCORRECT, but reason is CORRECT.

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Solution

The correct option is B If both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion.
Hexane has 6 carbon atoms and pentane has 5 carbon atoms and thus the surface area of hexane is more than pentane. Therefore more the surface area, higher is the boiling point.
Similarly, as n-alkanes have higher surface than their respective isoalkanes, n-alkanes have greater Van der Waal's force, so higher boiling point.

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