$\begin{array}{1 1} \text{The molecule of} N_2O_4 is planar \\ \text{The molecular of} N_20_4 \text{contains weak N-N -bond} \\ \text{In liquid} N_2O_4 Nocl \text{acts a base} \\ \text{The dipole moment of} N_2O_4 is zero \end{array} $
