Hydrocarbons Test - 8

This is because grignard reagents react with proton from methanol to give benzene and Mg(OMe)Br

 Due to unsaturation,ethene decolourises KMnO4 solution forming glycol.However it shows no reaction with ammoniacal cupric chloride.

The halogenation of alkanes follows free radical mechanism with the formation of free radical intermediates.As the secondary free radical is more stable than primary free radical, hence the product is 2-bromo-2-methylbutane.

Alkyl halides react with dialkyl copper reagents to give alkanes.This is Corey-House reaction and gives good yields of both symmetrical and unsymmetrical alkanes.

Elimination reaction takes place,a molecule of HBr gets eliminated to form propene.

Acetylene can be prepared by electrolysis of a concentrated solution of sodium or potassium salt of fumaric acid.This is the Kolbe's electrolytic method.