(a) When ethyl alcohol is heated with excess of concentrated sulphuric acid at 1600°C, ethene is formed.
(b) On passing ethene in cold aqueous solution of alkaline potassium permanganate, KMnO4 gets decolourized and ethane -1, 2-diol is formed.
(c) When vapours of ethyl alcohol are passed to hot aluminium oxide at 3600°C, ethene is formed.
(d) When isopropyl bromide is heated with alcoholic KOH, propene is formed.
(e) When high pressure is applied on ethylene in the presence of peroxide catalyst, it undergoes polymerization to form polyethene.
(f) On passing propylene on hot solution of potassium permanganate solution, diol is formed which further oxidise to form acetaldehyde and formaldehyde, which on further oxidation forms acetic acid and formic acid respectively.
(g) When ethylene reacts with hypochlorous acid, it forms ethylene chlorohydrin.
(h) When ozone is treated with ethylene, ethylene ozonide is formed.