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1) CH₂ = CH₂ + Br₂ ------> CH₂(Br) - CH₂(Br)
2) CH₂(Br) - CH₂(Br) + Br₂ --uv--> CH(Br₂) - CH₂(Br) + HBr
b) etyn ---> eten ---> etan
1) CH ≡ CH + H₂ ------> CH₂ = CH₂
2) CH₂ = CH₂ + H₂ ----> CH₃ - CH₃
c) etyn ---> 1,2-dibromoeten ---> 1,1,2,2-tetrabromoetan ---> heksabromoetan
1) CH ≡ CH + Br₂ --------> CH(Br) = CH(Br)
2) CH(Br) = CH(Br) + Br₂ ------> CH(Br₂) - CH(Br₂)
3) CH(Br₂) - CH(Br₂) + 2Br₂ ---uv---> CBr₃ - CBr₃ + 2HBr