Question

Which molecule will have a net dipole?

Answer 1

Those molecules which have polar bonds and a distorted geometry will have a net dipole moment.

Molecules with ideal geometry do not have a net dipole moment because the overall dipole moment is zero as all bonds cancel out polarity of each other.

CO2 has a linear geometry hence zero net dipole moment.

BF3 has a trigonal planar geometry hence zero net dipole moment.

CH4 has a tetrahedral geometry hence zero net dipole moment.

SO2 has a bent or V-shape geometry which is distorted, hence SO2 has net dipole moment.

Answer -- SO2