Q.

Which of the following has lowest boiling point? 

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a

n-Butane

b

iso-Butane 

c

n-Pentane 

d

iso-Pentane 

answer is C.

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Detailed Solution

Boiling point  Molecular weight α1branching

n-butane 273K
isobutane 261K
n-pentane 309K
isopentane 301K

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