CSe2 - Carbon Diselenide:

First draw the Lewis dot structure:
CSe2 Lewis Structure
Electron geometry: linear. Hybridization: sp

Then draw the 3D molecular structure using VSEPR rules:


Decision:
The molecular geometry of CSe2 is linear with symmetric charge distribution on the central atom.
Therefore CSe2 is non-polar.

Carbon Diselenide on Wikipedia.

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