\(1,C_xH_y+\left(x+\dfrac{y}{4}\right)O_2\underrightarrow{t^o}xCO_2+\dfrac{y}{2}H_2O\\ 2,CH_4+Cl_2\underrightarrow{as}CH_3Cl+HCl\\ 3,CH_2=CH_2+Br-Br\rightarrow CH_2Br-CH_2Br\\ 5,CH_2=CH_2\xrightarrow[xt]{t^o,p}\left(-CH_2-CH_2-\right)_n\\ 4,CH\equiv CH+2Br-Br\rightarrow CHBr_2-CHBr_2\\ 6,C_2H_4+H_2O\underrightarrow{axit}C_2H_5OH\)