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Q.

The correct order of melting points is

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a

propane < ethane < butane

b

butane < propane < ethane

c

ethane < propane < butane

d

etgane < butane < propane

answer is C.

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Detailed Solution

n-alkanes with an even number of carbon atoms have much higher melting points than the next lower n-alkane with an odd number of carbon atoms.

M.P of Ethane is -182.8oC

Propane  -188oC

 Butane -138oC

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