мой вариант
CaCO3 > CaO + CO2
CO2 + C > 2CO
CO + 3H2 > CH4 + H2O
CH4 + Cl2> CH3Cl + HCl
CH3Cl + 2Na + CH3-CH2Cl> C3H8 + 2NaCl
C3H8 > H2C=CH-CH3 + H2 (Kt=Ni,t)
H2C=CH-CH3 > H2C=CH=CH2(Kt=Ni,t)
H2C=CH=CH2 + Н2О> H2C=CH-CH2OH
H2C=CH-CH2OH + CuO > H2C=CH-CHOH
H2C=CH-CHOH + O2 >H2C=CH-CHОOH