Assertion :Boiling points of alkanes increase with increase in length of carbon chain. Reason: As the boiling point is determined by weight so the boiling point has a linear relation with the size of the molecule.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
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. As the number of C atoms increase, the van der Waal's force increase and the boiling point increases. Due to this, first four members of alkane family are gases, pentane to heptadecane are liquids and higher alkanes are solids.