Which of the following compound has the lowest boiling point?

C H_{3} I

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C H_{3} B r

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C H_{3} F

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C H_{3} C l

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Solution

The correct option is C $C H_{3} F$
Intermolecular forces of attractions increases as molecular size increases. So, large amount of heat require to break strong intermolecular forces and thus boiling point increases.
Here, the order of molecular size is as follows: $C H_{3} I > C H_{3} B r > C H_{3} C l > C H_{3} F$
Therefore in $C H_{3} F$ , the boiling point will be the lowest as it has the lowest molecular size.

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