2007-03-12 05:13:12 · 4 answers · asked by i-sena 1 in Science & Mathematics ➔ Chemistry
Sulphuric acid test for Alkanes and Alkenes:
Although alkanes are inert to cold, concentrated sulphuric acid, alkenes react by addition. The product, alkyl hydrogen sulphate, is soluble in concentrated sulphuric acid.
Procedure
To each of two 2 mL portions of concentrated sulphuric acid in separate test tubes add about 10 drops of alkane and alkene, respectively. Shake the tubes well and note the results. Discard the contents by pouring them into a beaker containing at least 50 mL of water.
Reaction Of Alkenes with Sulphuric Acid
Fuming sulphuric acid absorbs ethylene at room temperature to form ethyl hydrogen sulphate, with much evolution of heat.
C2H4 + H2SO4 ==> C2H5.HSO4
If this is treated with water and warmed, ethanol is formed.
heat
C2H5.HSO4 + H2O ==> C2H5OH + H2SO4
2007-03-19 01:57:04 · answer #1 · answered by sb 7 · 0⤊ 1⤋
Sulphuric acid reacts with alkenes because they are unsaturated, but not with alkanes, because they are saturated. The H2SO4 is acting as an electrophile here.
2007-03-12 12:31:23 · answer #2 · answered by Gervald F 7 · 0⤊ 0⤋
an complication-free attempt of Bromine Water, the unique shade of the Bromine water is Brown, yet while extra to an alkene it turns colourless, in no way placed clean on a attempt paper, clean is the incorrect term. while Bromine Water is extra to Alkanes in spite of if by way of fact they're saturated (No double bond, All area crammed with carbons) it continues to be brown.
2016-12-14 17:10:18 · answer #3 · answered by zagel 4 · 0⤊ 0⤋
what happens to the alkane?
2015-01-04 13:19:53 · answer #4 · answered by Alexis Haughton 1 · 0⤊ 0⤋