Arrange the following compounds in order of decreasing rate of hydrolysis for ${\mathrm{S}}_{\mathrm{N}}1$ reaction:

In the reaction

The major product of the following reaction is:

The reagent required for the following two step transformation are

The major product of the following reaction is:

The major product of the following reaction is:

The increasing order of reactivity of the following compounds towards reaction with alkyl halides directly is:

$\left(i\right)$

$\left(ii\right)$

$\left(iii\right)$

$\left(iv\right)$