# Which of the following molecule has the highest dipole moment

$\begin{array}{1 1}(a)\;CHCl_3&(b)\; CCl_4\\(c)\;[Ni(CN)_4]^{2-}&(d)\;[NiCl_4]^{2-}\end{array}$

Except $CHCl_3$,all other molecules has zero dipole moment.
Hence (a) is the correct answer.