Just as individual bonds in a molecule are often polar, molecules
as a whole are also often polar because of the net
sum of individual bond polarities. There are three possible
structures for substances with the formula C2H2Cl2, two of
which are polar overall and one of which is not.
(b) Which of the three structures is nonpolar, and which
two are polar? Explain.
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Master Molecular Polarity Concept 1 with a bite sized video explanation from Jules Bruno