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................etyn(acetylen)
CH≡CH + H2---->CH2=CH2
......................eten
CH2=CH2 + Br2---->CH2-CH2
.......................I......I
......................Br....Br
.................1,2-dibromoetan
CH2-CH2 + Zn---->CH2=CH2 + ZnBr2
I......I.................eten
Br....Br