Question

which molecule listed below is a polar molecule?
nh₃
h₂o
hcn
all of the compounds
none of the compounds

Explanation:

A polar molecule has a net dipole moment due to unequal electron distribution. $\text{NH}_3$ (trigonal pyramidal, N-H bonds polar, dipole not canceled), $\text{H}_2\text{O}$ (bent, O-H bonds polar, dipole not canceled), and $\text{HCN}$ (linear, H-C and C-N bonds polar, dipole not canceled) are all polar. Thus, all listed compounds are polar.

Answer:

D. all of the compounds