Question

Indicate whether the statement is true or false. if false, correct it to true:

a) ____dipole- dipole interaction strength increases with decreasing molecular polarity

b) _____hydrogen bonding occurs only between non polar hydrogen-containing molecules

c)____ london forces are extra strong dipole-dipole interactions

d) ___ substances in which hydrogen bonding is present usually have high vapor pressures.

Answer 1

a) True: dipole- dipole interaction strength increases with decreasing molecular polarity

b) False: hydrogen bonding occurs only between non polar hydrogen-containing molecules [hydrogen bonding occurs with polar hydrogens like H attached to O, N and F only which cause very polar bonds]

c) False: london forces are extra strong dipole-dipole interactions [london forces are weak and non bonding interactions]

d) False: substances in which hydrogen bonding is present usually have high vapor pressures [high vapour pressur means low boiling point, but the compound having hydrogen bonding have high boiling point eg. water due to low vapour pressure]