Fluorine-substituted Ethylene: C2H2F2

CIS isomer

• both C—F bonds on same side

? molecule is POLAR.

C—F bonds are MUCH more polar than C—H bonds.

TRANS isomer

• both C—F bonds on opposite side

? molecule is NOT POLAR.

??(C-F) = 1.5, ??(C-H) = 0.4

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