Problem: Dichloroethylene (C2H2Cl2) has three forms (isomers), each of which is a different substance. How many isomers of dichloroethylene have a zero dipole moment?

FREE Expert Solution

Isomers – same molecular formula, different structures


Central atom: C (less electronegative than Cl),  H can't be the central atom; carbon is the central atom


Total number of valence electrons present in C2H2Cl2 is:


            Group             Valence Electrons

C         4A                   2 × 4 e = 8 e

H         1A                   2 × 1 e = 2 e

Cl        7A                   2 × 7 e = 14 e

Total:  24 valence e


Bonding preferences:

Carbon: prefers to form 4 bonds
• Hydrogen: only forms 1 bond

• Chlorine: prefers to form 1 bond (when not the central atom)


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Problem Details

Dichloroethylene (C2H2Cl2) has three forms (isomers), each of which is a different substance. How many isomers of dichloroethylene have a zero dipole moment?

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