Напишите две различные структурные формулы соединений, имеющих молекулярную формулу С2Н4Вr2.
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а)                                             Н     Н
                                                 |        |
                                       Н –   С –  С – Вr
                                                 |       |
                                                H     Вr


б)                                          Н     Н
                                                 |        |
                                       Н –   С –  С – H
                                                 |       |
                                                Вr    Вr
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