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Question

Arrange the following compounds in increasing order of their boiling points.
I. CH3CH2CH2Br
II. CH3CH2CH2CH2Br
III. (CH3)2CHCH2Br
IV. (CH3)3CBr

A
II<I<III<IV
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B
III<I<IV<II
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C
IV<III<II<I
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D
I<IV<III<II
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Solution

The correct option is C I<IV<III<II
The boiling point increases as the number of carbon atoms in the carbon chain increases.
Among isomer alkyl halides boiling point decreases with the increase in branching in the alkyl group, because with branching the molecule attains special shape with less surface area.
Thus, the correct order is: I<IV<III<II

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