`a)`

TN1:

Nước bromine bị nhạt màu

`CH_2=CH_2+Br_2->CH_2Br-CH_2Br`

TN2:

Tạo kết tủa vàng nhạt

`CH≡CH+AgNO_3+NH_3->CAg≡AgC+NH_4NO_3`

`b)`

`CH_2=CH_2+H_2` $\xrightarrow{t^o,Ni}$ `CH_3-CH_3`

`CH_2=CH_2+Br_2->CH_2Br-CH_2Br`

`CH_2=CH_2+H_2O` $\xrightarrow{t^o,H^+}$ `CH_3-CH_2-OH`

`CH_2=CH_2+HCl` $\xrightarrow{t^o}$ `CH_3-CH_2-Cl`

`CH≡CH+2H_2` $\xrightarrow{t^o,Ni}$ `CH_3-CH_3`

`CH≡CH+2Br_2->CHBr_2-CHBr_2`

`CH≡CH+H_2O` $\xrightarrow{t^o,Hg^{2+}//H^+}$ `CH_3CHO`

`CH≡CH+HCl` $\xrightarrow{t^o,Hg^{2+}}$ `CH_2=CH-Cl`

`CH≡CH+AgNO_3+NH_3->CAg≡AgC+NH_4NO_3`