l-bromo-2, 2-dimethyl propane or 2- bromopropane.

Question

Choose the member that will react faster than the following pairs by S_N1 mechanism :

l-bromo-2, 2-dimethyl propane or 2- bromopropane.

Answer 1

The reactivity of S_N1 reaction depends on the steric hindrance, in 2-bromopropane, acarbon atom is attached to two methyl groups suffers greater steric hindrance to nucleophilic attack than l-bromo-2, 2-dimethyl propane. 

Hence, 

2-bromopropane react faster by S_N1 mechanism.