Which of the following has highest conductivity in aqueous solution ?

Sizes of alkali metal ions in fused state:

${\mathrm{Li}}^{+}<{\mathrm{Na}}^{+}<{\mathrm{K}}^{+}<{\mathrm{Rb}}^{+}<{\mathrm{Cs}}^{+}$

Hydrated ion size in aqueous solution;

${\mathrm{Li}}_{\left(\mathrm{aq}.\right)}^{+}>{\mathrm{Na}}_{\left(\mathrm{aq}.\right)}^{+}>{\mathrm{K}}_{\left(\mathrm{aq}.\right)}^{+}>{\mathrm{Rb}}_{\left(\mathrm{aq}.\right)}^{+}>{\mathrm{Cs}}_{\left(\mathrm{aq}.\right)}^{+}$

Mobility &  electrical conductivity in aqueous state:

${\mathrm{Li}}_{\left(\mathrm{aq}.\right)}^{+}<{\mathrm{Na}}_{\left(\mathrm{aq}.\right)}^{+}<{\mathrm{K}}_{\left(\mathrm{aq}.\right)}^{+}<{\mathrm{Rb}}_{\left(\mathrm{aq}.\right)}^{+}<{\mathrm{Cs}}_{\left(\mathrm{aq}.\right)}^{+}$

As the size of ion decreases nuclear charge increases,i.e degree of hydration increases and hence accumulation of water molecules around the ion increases
So mobility of ion increases
Therefore electrical conductivities decreases
Hint :