Concept explainers
(a)
Interpretation:
Out of the three isomers of difluoroethene, the polar forms have to be identified.
Concept Introduction:
VSEPR model is useful tool to determine shapes as well as properties such as polarity of molecules.
The extent of polarity is quantitatively expressed as dipole moment. It is defined as product of charges of two bonded atoms and the separation between them. The electronegativity difference decides the direction of dipole moment. It is indicated by an arrow head from positive end towards negative end.
For complex molecules, the shape must be determined prior to determination of individual dipoles. Thus shape is governed by the VSEPR model.
(b)
Interpretation:
The isomer with largest dipole moment has to be identified.
Concept Introduction:
Refer to part (a).
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Chemical Principles: The Quest for Insight
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