From the following given statements of the order of dipolemoments.
i) $\mathrm{HF}>{\mathrm{H}}_2\mathrm{O}>{\mathrm{NH}}_3$
ii) ${\mathrm{CH}}_3\mathrm{Cl}>{\mathrm{CH}}_2{\mathrm{Cl}}_2>{\mathrm{CHCl}}_3>{\mathrm{CCl}}_4$

 

The correct combination is

(i)  as E.N of bonded atom increases dipole moment increases.

(ii) Decreasing dipole moment : ${\mathrm{CH}}_3\mathrm{Cl}>{\mathrm{CH}}_2{\mathrm{Cl}}_2>{\mathrm{CHCl}}_3>{\mathrm{CCl}}_4$.  As no. of C-Cl bonds increases the net dipole moment decreases.

(iii) benzene has negligible dipole moment