Question

Which of these has nonzero orientation polarization? `"NH"_3`, `"BF"_3`

Answer 1

Orientation polarization is just the tendency to align the dipole of a molecule in the direction of the electric field to which it is subjected. This can only occur with molecules that have permanent dipole moments.

`"BF"_3` is trigonal planar, and `"NH"_3` is trigonal pyramidal. The former is a symmetrical triangle, and the latter has a dipole moment upwards through the nitrogen.

Thus, `"NH"_3` will have a nonzero orientation polarization...