Ch4→c2h2→c2h4→c2h5br→c2h4br2 cac2→c2h5cl→c2h4→c2h4br2→

2cu+o2=2cuo

cuo+h2so4=cuso4+h2o

cuso4+2naoh=cu(oh)2+na2so4

cu(oh)2=cuo+h2o

cuo+h2=cu+h2o

с соляной кислотой:

mg + 2hcl= mgcl2+h2

mgo+2hcl=mgcl2+h2o

mgco2+2 hcl= mgcl2+h2+co2

mg(oh)2+2hcl=mgcl2+2h2o

точно 2-я кислота