Hydrogen has an ionisation energy of $1311 \mathrm{~kJ}$ $\mathrm{mol}^{-1}$ and for chlorine it is $1256…
Hydrogen has an ionisation energy of $1311 \mathrm{~kJ}$ $\mathrm{mol}^{-1}$ and for chlorine it is $1256 \mathrm{~kJ} \mathrm{~mol}^{-1}$. Hydrogen forms $\mathrm{H}^{+}$ (aq) ions but chlorine does not form $\mathrm{Cl}^{+}(\mathrm{aq})$ ions because
$\mathrm{H}^{+}$ has lower hydration enthalpy
$\mathrm{Cl}^{+}$ has lower hydration enthalpy
$\mathrm{Cl}$ has high electron affinity
$\mathrm{Cl}$ has high electronegativity
Solution
Hydration energy of $\mathrm{Cl}^{+}$ is very less than $\mathrm{H}^{+}$, hence it doesn't form $\mathrm{Cl}^{+}$ (aq) ion.