CaC2->C2h2->CH3OH->C2H5OH->C2H4->C2H5->C2H5OH->C4H6->C4H8Br2

1) CaC2+2HOH=Ca (OH) 2+C2H22) 2C2H2+5O2=4CO2+2H2OCO2+C=2COCO+2H2=CH3OH3) CH3OH+HCl=CH3Cl+H2O2CH3Cl+2Na=2NaCl+C2H6CH3-CH3+Cl2=CH3-CH2Cl+HClCH3-CH2Cl+KOH=CH3-CH2OH+KCl3) C25OH=C2H4+H2O 4) C2H4+H2=C2H65) C2H6+Cl2=C2H5Cl+HClC2H5Cl+NaOH=C2H5OH+NaClC2H5OH+HCl=C2H5Cl+H2O2C2H5Cl+2Na=2NaCl+C4H10C4H10=C4H6+2H2C4H6+2HBr=C4H8Br2