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–
• Carbon: prefers to form 4 bonds
• Hydrogen: only forms 1 bond
• Chlorine: prefers to form 1 bond (when not the central atom)
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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