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Which choice represents a pair of resonance structures?
a) :Cl⋅⋅⋅⋅−O⋅⋅⋅⋅−H:Cl⋅⋅⋅⋅−O⋅⋅⋅⋅−H and :Cl⋅⋅⋅⋅−O⋅⋅⋅⋅:−:Cl⋅⋅⋅⋅−O⋅⋅⋅⋅:−
b) N⋅⋅N⋅⋅≡C−Br⋅⋅⋅⋅:≡C−Br⋅⋅⋅⋅: and C⋅≡N⋅−Br⋅⋅⋅⋅:C⋅≡N⋅−Br⋅⋅⋅⋅:
c) O⋅⋅⋅⋅=O⋅⋅⋅⋅O⋅⋅⋅⋅=O⋅⋅⋅⋅ and :F⋅⋅⋅⋅−F⋅⋅⋅⋅::F⋅⋅⋅⋅−F⋅⋅⋅⋅: :
d) O⋅⋅⋅⋅−S⋅⋅⋅=O⋅⋅::O⋅⋅⋅⋅−S⋅⋅⋅=O⋅⋅: and :O⋅⋅=S⋅⋅⋅−O⋅⋅⋅⋅::O⋅⋅=S⋅⋅⋅−O⋅⋅⋅⋅:
In order to decide which carbon-hydrogen bond is the shortest and the strongest from the given molecules, we need to know first that the shorter the bond, the stronger it is, and as the number of electron pairs in a bond between two atoms increases, the bond's strength also increases.
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