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Arrange the following in decreasing order of their boiling points:
(I) n-Butane
(II) 2-Methylbutane,
(III) n-Pentane
(IV) 2,2-Dimethylpropane
A. IgtIIgtIIIgtIV
B. IIgtIIIgtIVgtI
C. IVgtIIIgtIIgtI
D. IIIgtIIgtIVgtI

1 Answer

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Best answer
Correct Answer - D
Boiling point of alkanes increases with increase in molecular mass and for the same alkane the boiling point decreases with branching.
Thus, the decreasing order of their boiling points is:
`underset(III)("n-Pentane") gt underset((II))("2-Methylbutane")gt underset((IV))("2,2-Dimethylpropane")gtunderset((I))("n-Butane")`

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