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Q.

The correct order of melting points of alkanes is

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a

butane < propane < ethane

b

ethane < butane < propane

c

ethane < propane < butane

answer is A.

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Detailed Solution

With increasing number of carbon atoms in an alkane, surface area increases and thus magnitude of force increases. Thus, the melting point of the given alkanes increases as the molecular mass increases:

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