PCl3 - Phosphorus Trichloride:

First draw the Lewis dot structure:
PCl3 Lewis Structure
Electron geometry: tetrahedral. Hybridization: sp3

Then draw the 3D molecular structure using VSEPR rules:
  Click and drag the molecle to rotate it.

Decision:
The molecular geometry of PCl3 is trigonal pyramidal with asymmetric charge distribution on the central atom.
Therefore this molecule is polar.

Phosphorus Trichloride on Wikipedia.
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