液氨的条件下 HC≡CH+NaNH2→HC≡CNa；         HCCNa+C2H5Br→HC≡C－C2H5；（炔所独有的链增长反应）HC≡C－C2H5+H2=C4H10；C4H10+Br2=C4H9Br；HC≡C－C2H5+Na...