Which of the following alkyl halides is most reactive towards the $S_{N}1$ mechanism?

The major product of the following reaction is:

Select the reagent that will yield the greater amount of substitution on reaction with $CH_3CH_2Br$.

The correct statement regarding nucleophilic substitution reaction in a chiral alkyl halide is:

The reaction of $1$-bromohexane with aqueous $NaOH$ solution follows the order

Given below are two statements:
Statement $I$: $(Et)_2N-CH_2CH_2Cl$ will undergo alkaline hydrolysis at a faster rate than $(Et)_2CH-CH_2CH_2Cl$.
Statement $II$: Intramolecular substitution takes place first by involving the lone pair of electrons on nitrogen.
In the light of the above statements,choose the most appropriate answer from the options given below: