Question

What typically occurs in a substance where hydrogen bonding exists when compared to the same substance without H-bonds?

Question options:

A) Decrease in boiling point and decrease in vapor pressure

B) Increase in boiling point and decrease in vapor pressure

C) Increase in boiling point and increase in vapor pressure

E) Decrease in boiling point and increase in vapor pressure

F) There is no difference

Answer 1

B) Increase in boiling point and decrease in vapor pressure

Step-by-step explanation:

Vapor pressure is inversely related to the Boiling point , as

higher the boiling point, lower the vapor pressure. and

Lower the boiling point, higher the vapor pressure.

Hydrogen bonding.

The electrostatic attraction between Hydrogen , bonded to electronegative atom like F, O, N and the more electronegative atom is called as Hydrogen bonding.

For example -

In alcohols, - OH group has Hydrogen that is bonded to more electronegative atom O.

As ,

Extra energy is required to break Hydrogen bonds.

because the substance which exhibits Hydrogen bonding have lower vapor pressure than that of the substance with out Hydrogen bonding.

Hence , the substance with Hydrogen bonding , has higher boiling point,.

Hence , the correct option is Increase in boiling point and decrease in vapor pressure .