Урівняти C2H6 + Br = C2H5Br + HBr C4H19 + Cl = C4H10Cl2 + HCl  

первая  1) CaC2 + 2H2O = Ca(OH)2 + C2H2  2) C2H2 + H2O = CH3CHO  CH3CHO + H2 = CH3CH2OH  3)CH3CH2OH + CuO = CH3CHO + Cu + H2O  СH3CHO + Ag2O = CH3COOH + 2Ag  вторая  1) С + 2H2 = CH4  2)CH4 + CL2 = CH3CL + HCL  3) 2CH3CL + 2Na = C2H6 + 2NaCL  C2H6 = C2H4 + H2  третья  1) С2H4 + HBr = C2H5Br  2) C2H5Br + NaOH = C2H5OH + NaBr  3) C2H5OH + CH3COOH = CH3COOC2H5  четвертая  1) CH3COOH + H2 = CH3CHO + H2O  2) СH3CHO + Ag2O = CH3COOH + 2Ag  3) CH3COOH + NaOH = CH3COONa + H2O  пятая  1) C2H2 + H2O = CH3CHO  2) CH3CHO + Ag2O = CH3COOH + 2Ag  3) CH3COOH + C3H7OH = CH3COOC3H7 + H2O вроде так