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Identify the polarity of the CL atoms in the non-polar CCI4 molecule

HCN is a linear molecule Predict whether this molecule is polar or non-polar

 

[jazz519]

Chlorine is a highly electronegative element

A polar molecule has an uneven electron distribution
A non-polar molecule has an even electron distribution

In HCN the atoms have different electronegativity (the tendency to attract electrons) and so there will be an uneven electron distribution. The molecule is therefore polar