83. Which of the following statements is the best to describe the results of attempted separation by fractional distillation of the two isomers of 1,2-dichloroethene? (A) They can be separated by fractional distillation, with isomer 1 boiling at the lower temperature. (B) They can be separated by fractional distillation, with isomer 2 boiling at the lower temperature. (C) They cannot be separated by fractional distillation because both isomers have the same boiling point. (D) They cannot be separated by fractional distillation because they interconvert rapidly at the distillation temperature. (E) They cannot be separated by fractional distillation because they have the same molecular weight and reactivity.