✔ 最佳答案
C. of course.
A: burning ethene in oxygen produces CO2. burning in air may produce carbon monoxide or soot (incomplete combustion). (however, WHO would make CO2in this way?)
B: passing ethene into conc. sulphuric acid followed by heating in water yields ethanol. ethene (CH2=CH2) ------ [ethyl hydrogensulphate (CH3CH2OSO3H)](not important step) ------- ethanol (CH3CH2OH)
D: i wonder why they say that it is hydrogenation. in fact, it is an addition reaction with halogen. simply adding bromine (in organc solvents) yields the product----saturated, but with no extra hydrogen.
C: yes...first produce ethanol from ethene (see B), then heat with conc. sulphuric acid and ethanoic acid (it may be produced by oxidation of ethanol by acidified potassium dichromate). ethene ------ ethanol ------- ethyl ethanoate (CH3COOCH2CH3)
2006-10-31 19:37:50 補充:
"catalytic dehydration" is a term meaning removal of water molecules from a compound by passing it through a (usually hot) catalyst.
2006-10-31 19:38:02 補充:
for example, ethanol produces ethene when allowed to pass through strongly heated pieces of broken porecelein (hope i have not spell it wrong). CH3CH2OH --------- CH2=CH2OR passing ethanol into conc. sulphuric acid will do.