HCl: Strong acid (low pH)
$\mathrm{N}{\mathrm{H}}_4\mathrm{C}\mathrm{l}$ : Salt of weak base + strong acid $\to$ it gives acidic solution. (pH less than 7)
NaCl: Salt of strong base + strong base $\to$ it gives neutral solution with pH $=$ 7.
NaCl: Salt of strong base + weak acid $\to$ it gives basic solution with pH > 7.
Thus the increasing order of pH is
$\mathrm{H}\mathrm{C}\mathrm{l}<\mathrm{N}{\mathrm{H}}_4\mathrm{C}\mathrm{l}<\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}<\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{N}$