BCl₃ - Boron Trichloride:

First draw the Lewis dot structure:

Electron geometry: trigonal planar. Hybridization: sp²

Then draw the 3D molecular structure using VSEPR rules:


Decision:
The molecular geometry of BCl₃ is trigonal planar with symmetric charge distribution around the central atom.
Therefore this molecule is nonpolar.

Boron Trichloride on Wikipedia.

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