Rationalize The Difference In Boiling Points In Each Pair

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Rationalize the difference in boiling points in each pair:

CHCL3 (61  °C)

and

CHBr3 (150  °C)

Answer

We need to know what makes the given two molecules boiling point differently.

For this problem we have,

  • CHCl3: 61  °C
  • CHBr3: 150  °C

We can say that CHBr3 has a higher boiling point than CHCl3.

The reason for that is CHBr3 has a greater molecular weight.

If the molecule has a greater molecular weight then there is greater polarizability resulting in a more strong dispersive force.

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