1)Ca\rightarrow CaC_{2}\rightarrow C_{2}H_{2}\rightarrow C_{2}H_{4}\rightarrow C_{2}H_{5}OH\rightarrow CH_{3}COOH\rightarrow (CH_{3}COO)_{2}Mg
2)C_{2}H_{2}\rightarrow C_{6}H_{6}\rightarrow C_{6}H_{5}Br
3)CO_{2}->Tinh bột->gluco->Rược etylic->axit axetic->axetat Natri->Metan...