Classify the following reactions in one of the reaction type studied in this unit.

 a. Nucleophilic substitution reaction as bromide ion is substituted with HS^– acts as ion.

b.   Addition   reaction as HCl is added to the carbon carbon double bond.

c.   Nucleophilic   substitution and 1, 2-Methyl shift as hydroxide ion is substituted with bromide ion and involves rearrangement of methyl group.

d.   Elimination  reaction as molecule of HBr is eliminated.