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Đáp án + Giải thích các bước giải:

`(1)` $C_{2}H_{4}+3O_{2}\xrightarrow[]{t^{o}}2H_{2}O+2CO_{2}\uparrow$

`(2)` `CO_2+NaOH->NaHCO_3`

`(3)` `NaHCO_3+Ca(OH)_2->CaCO_3↓+H_2O+NaOH`

`(4)` $C_{2}H_{4}+H_{2}\xrightarrow[Ni]{t^{o}}C_{2}H_{6}\uparrow$

`(5)` $C_{2}H_{6}+Cl_{2}\xrightarrow[]{ánh sáng}C_{2}H_{5}Cl+HCl$

`(6)` $C_{2}H_{4}+HCl\xrightarrow[]{askt}C_{2}H_{5}Cl$