<em><span>Cu(OH)2+2HCl = CuCl2+2H2O</span></em>
<em><span><span>CuCl2+2AgNO3 = Cu(NO3)2+2AgCl</span></span></em>
<em>2 Cu(NO3)2 = 2CuO + 4NO2 + O2</em>
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C2H2 + Br2 (hv)= CHBr=CHBr
CHBr=CHBr + H2 (t, Ni)= CH2Br—CH2Br
CH2Br—CH2Br + 2NaOH = 2NaBr + 2H2O + C2H2