Arrange the following compounds in increasing order of their boiling points.
I. ${C H}_{3} {C H}_{2} {C H}_{2} B r$
II. ${C H}_{3} {C H}_{2} {C H}_{2} {C H}_{2} B r$
III. ${({C H}_{3})}_{2} C H {C H}_{2} B r$
IV. ${({C H}_{3})}_{3} C B r$

I I < I < I I I < I V

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I I I < I < I V < I I

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I V < I I I < I I < I

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I < I V < I I I < I I

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Solution

The correct option is C $I < I V < I I I < I I$
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: $I < I V < I I I < I I$

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