The correct order of boiling points of 2. 2-dimethylpropane 2-methylbutane and n-pentane is.

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2, 2-dimethylpropane > 2-methylbutane > n-pentane

n-pentane > 2-rnethylbutane > 2, 2-dimethylpropane

n-pentane > 2. 2-dimethylpropane > 2-methylbutane

2-methylbutane > n-pentane > 2. 2-dimethylpropane

answer is B.

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Detailed Solution

Branching of the chain makes the molecule more compact and thereby decreases the surface area. The intermolecular forces which depend upon the surface area. become small in magnitude on account of branching. Consequently. the boiling points of branched chain alkanes are less than the straight chain isomers.

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