CHEM. long question

(1) Draw an electron diagram of propene, showing the outermost shell electrons only.

http://i841.photobucket.com/albums/zz333/tammie_0666/2010-11-1.jpg?t=1288548337

圖片參考：http://i841.photobucket.com/albums/zz333/tammie_0666/2010-11-1.jpg?t=1288548337



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(2) Propyne is an organic compound. Its structural formula is CH3-C≡CH. Explain whether propyne or propene would produce a sootier flame when burnt.

Propyne (C3H4) would produce a sootier flame when burnt than propene (C3H6), because propyne has a higher carbon content (higher percentage of carbon).


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(3) Apart from combustion and reaction with halogens, describe a chemical test to distinguish between compound B (butane) and but-2-ene.Write down an equation for the reaction involved.

Shake separately butane and but-2-ene with bromine solution in tetrachloromethane. Butane does not react and is with no observable change, but but-2-ene decolorizes the brown solution of bromine.
CH3-CH=CH-CH3 + Br2 → CH3-CHBr-CHBr-CH3

What is compound B???
we cannot distinguish a thing without knowing its identity!