2-Methyl propyl bromide reacts with X and gives 'A,' whereas on reaction with Y, it gives 'B.' The mechanism followed in these reactions and the products 'A' and 'B' respectively are:
a) Nucleophilic substitution, A = 2-methylpropene, B = 2-methylpropanol
b) Elimination, A = 2-methylpropene, B = 2-methylpropanol
c) Nucleophilic substitution, A = 2-methylpropanol, B = 2-methylpropene
d) Elimination, A = 2-methylpropanol, B = 2-methylpropene