CH4->CH3Br->CH3-CH3->CH2=CH2
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CH3-OH CH3-CH2-No2 CH2-CH2
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OH OH
CH4+Br2->t->CH3Br+HBr
2CH3Br + 2Na => CH3-CH3 + 2NaBr-реакция Вюрца
CH3-CH3 => CH2=CH2 +H2(дегидрирование-отщепление водорода)