Bài làm :
1, `C_2H_4+Br_2->C_2H_4Br_2`
`C_2H_2+2Br_2->C_2H_2Br_4`
2, `Na_2CO_3+2HCl->2NaCl+H_2O+CO_2`
3, `C_2H_2+2Br_2->C_2H_2Br_4`
4, `C_6H_6+Br_2` $\xrightarrow{t^o/Fe}$ `C_6H_5Br+HBr`
5, `CaC_2+2H_2O->Ca(OH)_2+C_2H_2`
6, `CH_4+Cl_2` $\xrightarrow{ \text{ánh sáng}}$ `CH_3Cl+HCl`
7, `n(CH_2=CH_2)` $\xrightarrow{t^o,xt,p}$ $(\kern-6pt-CH_2-CH_2-\kern-6pt)_{n}$
8,
`CH_4+2O_2` $\xrightarrow{t^o}$ `CO_2+2H_2O`
`C_2H_4+3O_2` $\xrightarrow{t^o}$ `2CO_2+2H_2O`
`C_2H_2+5/2O_2` $\xrightarrow{t^o}$ `2CO_2+H_2O`