Question

Which molecule is a dipole?
A.
CH4
B.
N2
C.
CCl4
D.
NO2
E.
BF3

Answer 1

Dipole: compounds with a net dipole moment, i.e. it has polar bonds which do not cancel out

A. CH4 - no polar bonds
B. N2 - no polar bonds
C. CCl4 - polar bonds, but it cancels out.

Answer 2

NO2 has dipole :)