CH4-C2H2-C2H2Br2-C2H2(OH)2
1) 2CH₄ --(1500°C)--> HCΞCH + 3H₂î
2) HCΞCH + Br2 ---> HC=CH
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Br Br
3) HC=CH + 2NaOH --(t)--> HC=CH + 2NaBr
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Br Br OH OH