$CH_3CH(Br)CH_2CH_3 + \text{alc. } KOH \to$ ?

Arrange the compounds of each set in order of reactivity towards $S_{N}2$ displacement:
$(i)$ $2-Bromo-2-methylbutane$,$1-Bromopentane$,$2-Bromopentane$
$(ii)$ $1-Bromo-3-methylbutane$,$2-Bromo-2-methylbutane$,$2-Bromo-3-methylbutane$
$(iii)$ $1-Bromobutane$,$1-Bromo-2,2-dimethylpropane$,$1-Bromo-2-methylbutane$,$1-Bromo-3-methylbutane$.

The reaction of $4-methylcyclohexyl$ halide with $OH^-$ via the $S_N2$ mechanism produces $A$. Identify $A$.

Which of the following undergoes $S_{N^{1}}$ reaction?

Identify the correct reactivity order for $S_N1$ reaction for the following compounds:

Which of the following is the correct decreasing order of the boiling point of the given compounds?