# The non-polar molecule is

$\begin{array}{1 1}(a)\;NH_3&(b)\; Cis\; 1,2-\text{dichloro ethane}\\(c)\;1,3 \text{dichlorobenzene}&(d)\;\text{1,2-dichloroethene}\end{array}$

A nonpolar molecule is a molecule which has no separation of charge, so no positive or negative poles are formed. In other words, the electrical charges of nonpolar molecules are evenly distributed across the molecule. Nonpolar molecules tend to dissolve well in nonpolar solvents, which are frequently organic solvents.
Hence (d) is the correct answer.
edited Oct 26, 2017 by meena.p