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

${\text{BF}}_{3}$ is trigonal planar, and ${\text{NH}}_{3}$ is trigonal pyramidal. The former is a symmetrical triangle, and the latter has a dipole moment upwards through the nitrogen.
Thus, ${\text{NH}}_{3}$ will have a nonzero orientation polarization...