Ответы на вопрос:
1)сh4 + cl2 = ch3cl + hcl
2)2ch3cl +2 na = ch3- ch3 + 2nacl
3)ch3 - ch3 + br2 = ch3ch2br + hbr
4)2ch3 - ch2br + 2na = ch3 - ch2 - ch2 - ch3 + 2nabr
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