\(X:C_2H_5OH,A:C_2H_4,Y:-\left(CH_2-CH_2\right)-_n\\ \left(1\right)\left(C_6H_{10}O_5\right)_n+nH_2O->nC_6H_{12}O_6\\ \left(2\right)C_6H_{12}O_6-lên.men.rượu->2C_2H_5OH+2CO_2\\ \left(3\right)C_2H_5OH-H_2SO_4đ,t^0C->C_2H_4+H_2O\\ \left(4\right)nC_2H_4-t^0,p,xt->-\left(CH_2-CH_2\right)-_n\)