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Question

Arrange the following alkanes in the increasing order of their boiling point:
pentane, hexane, 23dimethylbutane

A
pentane<2,3dimethylbutane<hexane
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B
hexane<2,3dimethylbutane<pentane
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C
pentane<hexane<2,3dimethylbutane
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D
none of the above
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Solution

The correct option is B pentane<2,3dimethylbutane<hexane
As the molecular weight increases, the boiling point also increases. Also, with decrease in the degree of branching, the boiling point decreases. Hence, the increasing order of the boiling points is pentane <2,3 dimethylbutane < hexane.

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