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Dipole moment of vinyl chloride (CH(2) =...

Dipole moment of vinyl chloride `(CH_(2) = CHCI)` is less than the dipole moment of ethyl chloride `(CH_(3)CH_(2)CI)` - explain.

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In vinyl chloride, the moment caused by the -I effect of CI - atom `(mu_(sigma))` is parially neutralised by the moment caused by its + R effect `(mu_(pi))` . As a result, the value of net moment of vinyl chloride decreases and it is lower than that of ethyl chloride in which only the stronger -I effect of chloride operates.
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