What happens when:
(i) Ethyl alcohol is heated in the presence of Al2O3 at 493 K?
(ii) Ethylene dibromide is heated with zinc dust?
Discuss the mechanism of addition hydrogen acids to symmetrical alkenes. Justify the order of reactivity of halogen acids HI > HBr > HCl.
Define Markownikoff's rule giving an example.
This rule states: In a normal addition, the negative part of the addendum (molecule to be added) adding to the double bond of an unsymmetrical alkene goes to that carbon atom which has lesser number of hydrogen atoms. Examples are: