CH₂O - Formaldehyde:

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 CH₂O is trigonal planar with asymmetric charge distribution.
Therefore this molecule is polar.

Formaldehyde on Wikipedia.

Back to Molecular Geometries & Polarity Tutorial: Molecular Geometry & Polarity Tutorial.

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