I have the honour to state that I have faced some problem with those question below:1.How to seperate each elements when they are exist in a one container:ethene,ethyne,ethane?2.To produce Alkylbromide we need Alkanol,HBr and H2SO4 but H2SO4 is not necessary to produce Alkyliodide-Why?3.Diamminecopperchloride [Cu(NH3)2]Cl reaction with Alkyl-1-yne but why it doesn’t reaction withAlkyl-2-yne orAlkyl-3-yne ?It will be grateful if anyone answer those question..please,please.Yours sincerely,emon hossain raihan

@ emon 
if u have a mixture of ethyne , ethane , and ethene . then u can separate it with the help of tollens reagent . 
on passing them,ethyne will give white precipitate . of silver acetylide .
while rest of the gases will not show any reaction . 
ethyne can be regenarated by treating the white precipitate of disilver acetyldide . with dil . nitric acid . 
rest of the gases containing ethene and ethane passed through cold conc h2so4 , when ethene is absorbed as ethyne hydrogen sulphate , and ethane escape out which is collected . |
the ethyl hydrogen sulphate will be collected in a separte container after heating . 
HOPE IT HELPS 
ALL THE BEST ..