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Question

Arrange each group of compounds in order of increasing boiling point. Explain?
 $$ F_{2}$$,  $$Cl_{2}$$,   $$Br_{2} $$ 


Solution

Answer 
$$ F_{2} < Cl_{2} < Br_{2} $$ 

Explanation :
As you know, a molecule's boiling point depends on the strength of the intermolecular forces of attraction its molecules exhibit.

Higher boiling points will correspond to stronger intermolecular forces. 

1. None of these have hydrogen bonding.
2. None of these have dipoles.
3. Bigger molecules will have stronger London dispersion forces. So $$Br_2$$ has the strongest forces, and $$F_2$$ will have the weakest.

Correspondingly, $$Br_2$$ will have the highest boiling point and $$F_2$$ will have the lowest boiling point.


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