Осуществить превращение: а) CH4-->C2H4-->C2H4-->CH2Cl - CH2Cl-->CH2OH - CH2OH б)Ca-->Ca(OH2)-->CaCO3-->CaCO3-->CaO-->CaCl2-->Ca
2CH4=====C2H2 +3H2
C2H2 +H3=C2H4
C2H4+CI2=C2H4CI2
C2H4CI2 +2NaOH вода=C2H4(OH)2
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2CH4=====C2H2 +3H2
C2H2 +H3=C2H4
C2H4+CI2=C2H4CI2
C2H4CI2 +2NaOH вода=C2H4(OH)2