Assertion :Boiling point of pentane is higher than 2,2-dimethylpropane. Reason: There is steady increase in boiling point with increase in molecular mass.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and 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 and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Pentane has a high boiling point because it is straight-chain isomer whereas 2,2-dimethylpropane is branched-chain due to which the molecule attains the shape of a sphere.

Thus, results in a smaller area of contact and therefore weak intermolecular forces.

Hence, the correct answer is option $B$ .

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