Question

1.Select the correct alternative in relation to the type of intermolecular force that describes the following two compounds: CH3CH2OH and CH3CH2OCH3

A) only dispersion forces in both

B) dispersion, dipole-dipole and hydrogen bonds in both

C) dispersion and dipole-dipole in both

D) dipole-dipole and hydrogen hydrogen in both

2.Glycerol is more viscous than ethanol; We can establish that:

A) the intermolecular forces of glycerol and ethanol have equal strength

B) the intermolecular forces of ethanol have greater strength than those of glycerol

C) the intermolecular of glycerol forces have greater strength than those of ethanol

D) viscosity does not depend on temperature

3.Which of the following properties of liquids decreases as the other three increase?

A) intermolecular forces

B) boiling point

C) surface tension

D) vapor pressure

Answer 1

1)   C) dispersion and dipole-dipole in both

reason : alcohol has hydrogen bond but ether doesnot have . dispersion forces are common in any compound

2) C) the intermolecular of glycerol forces have greater strength than those of ethanol

reason : glycerol has three -OH groups so it can form more hydrogen bonds . ethanol has also hydrogen bond but lesser strength than glycerol

3) D) vapor pressure

reason : boiling, intermolecular , surface tension these are follows same trend. but vapour pressure decrease with any one of the three increases