Arrange the following compounds in decreasing order of their boiling points :
(i) $C H_{3} B r$
(ii) $C H_{3} C H_{2} B r$
(iii) $C H_{3} C H_{2} C H_{2} B r$
(iv) $C H_{3} C H_{2} C H_{2} C H_{2} B r$

(i) > (ii) > (iii) > (iv)

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(iv) > (iii) > (ii) > (i)

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(i) > (iii) > (ii) > (iv)

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(iii) > (iv) > (i) > (ii)

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Solution

The correct option is C (iv) > (iii) > (ii) > (i)
The boiling point of haloalkanes decreases with increase in branching. For the alkyl/aryl group, the boiling points of alkyl halides decrease in order $R I > R B r > R C l > R F$ . This is because with the increase in size and mass of halogen atom, the magnitude increases. So B is the correct option.

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