Molecules with non-zero dipole moments include which of those listed?

(P) ${\mathrm{H}}_2\mathrm{C}=\mathrm{CHCl}$   (Q) $\text{ cis-ClHC }=\mathrm{CHCl}$  (R) $\text{ trans }-\mathrm{ClHC}=\mathrm{CHCl}$

$\mu \ne 0$ for ${\mathrm{CH}}_2=\mathrm{CHCl}$ and $\mathrm{cis}-\mathrm{ClHC}=\mathrm{CHCl}$.

In both of them, there is some value of net dipole moment. Thus, P and Q are correct choices.