Ответы на вопрос:
Ch4 -> ch3br -> c2h6 -> c2h4 -> c2h2 -> c6h6 ch4+br2[свет] -> ch3br+hbr 2ch3br +2na-> c2h6 +2nabr c2h6 [al2o3]-> c2h4+h2 c2h4 [al2o3]-> c2h2 +h2 2c2h2[c,t ] -> c6h6
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