For the following the increasing order of nucleophilicity would be:

(i) $\mathrm{I}-$
(ii)$\mathrm{CI}-$
(iii)$\mathrm{Br}$

The correct order of decreasing nucleophilicity for the following is:

(1) ${\mathrm{CH}}_3{\mathrm{O}}^{-}$
(11) ${\mathrm{H}}_2\mathrm{O}$
(III) ${\mathrm{OH}}^{-}$
(IV) ${\mathrm{CH}}_3{\mathrm{COO}}^{-}$

When the concentration of alkyl halide is doubled and the amount of ${\mathrm{H}}_2\mathrm{O}$ taken as solvent is reduced to half, the rate of  ${\mathrm{S}}_{\mathrm{N}}1$ reaction increases by:

What will be the major product of the following reaction?

$\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }\mathrm{Product}$