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Question

Which is the correct increasing order of boiling points of the following compounds?
1 - Iodobutane, 1 - Bromobutane, 1 - Chlorobutane, Butane

A
Butane < 1 - Chlorobutane < 1 - Bromobutane < 1 - Iodobutane
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B
1 - Iodobutane < 1 - Bromobutane < 1 - Chlorobutane < Butane
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C
Butane < 1 - Iodobutane < 1 - Bromobutane < 1 - Chlorobutane
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D
Butane < 1 - Chlorobutane < 1 - Iodobutane < 1 - Bromobutane
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Solution

The correct option is A Butane < 1 - Chlorobutane < 1 - Bromobutane < 1 - Iodobutane
More the molar mass of compound,more will be boiling point.So boiling point order will be Butane<1chlorobutane<1bromobutane<1iodobutane.
As molecular mass is increasing so boiling point also increase.

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