Assertion :A straight chain alkene has higher boiling point than a branched chain alkane with same number of carbons. Reason: Branching decreases the surface area, hence,van der Waal's force of attraction

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The boiling point of straight chain alkene is higher than that of branched chain alkene having same number of carbon atoms. Thus, the boiling point of alkenes follows the order normal > iso > neo. With an increase in the extent of branching, the surface area decreases and the Van der Waal's forces of attraction decrease. This decreases the boiling point. Thus, the boiling point is directly proportional to the surface area which is proportional to the molecular weight.

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