理工学科-化学：关于消去反应

BrCH2CH2Br+NaOH ==CH2?CH?Br+NaBr+H2O (消去1分子HBr) BrCH2CH2Br+2NaOH ==CH≡CH+2NaBr+2H2O (消去2分子HBr) 等号是箭头