Question

-which exhibits H bonding and draw the H bonds between two of its molecules if it does: C2H6 and CH3OH

-identify key bonding and/or intermolecular force(s) and predict which one pair has higher boiling point:

a: CH3NH2 or CH3F

b: CH3OH or CH3CH2OH

c. hexane or 2,2-dimethlybutane

Answer 1

1. The attraction between the hydrogen and the most electronegative atoms like oxygen, nitrogen and fluorine forms a bond. This is known as hydrogen bonding.

Ethane is a non polar compound, and it doesnt contain any O, N and F. So, it do not exhibit hydrogen bonding.

Methanol is a polar compound. It exhibits hydrogen bonding. The bonds are shown as follows:

2. (a) CH3NH2 and CH3F are both polar. Here, CH3NH2 can forms H bond while CH3F cannot. So, CH3NH2 has higher boiling point.

(b) CH3OH and CH3CH2OH can form H bond but CH3CH2OH exhibits more dispersion force interaction. So, CH3CH2OH has high boiling point.

(c) Hexane and 2,2-dimethylbutane are nonpolar compounds. Here, only dispersion forces are present. Hexane has the larger surface area, so higher will be the boiling point.