Step 1:Carbon (EN = 2.5) is less electronegative than Bromine (EN = 2.8) and hydrogen can only make 1 bond socarbon is the "central atom".
You are watching: Nonpolar c2h2br2 (two structure)
Step 2:The total number of valence electrons present in C2H2Br2 is:
Group Valence Electrons
C 4A 2 × 4 e– =8 e–
H 1A 2 × 1 e– =2 e–
Br 7A 2 × 7 e– =14 e–
Total: 24 valence e–
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There are 3 different possible isomers of a dibromoethene molecule, C2H2Br2. One of them has no net dipole moment, but the other two do. Draw Lewis structures for each of these isomers. Include H atoms.
Nonpolar C2H2Br2 (one isomer)
Polar C2H2Br2(two isomers)
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