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# The molecule that will have dipolemoment is

$\begin{array}{1 1}(a)\;2,2-dimethylpropene\\(b)\; Cis-3-hexene\\(c)\;1,4-dichlorobenzene\\(d)\;2,2,3,3-tetramethylbutane\end{array}$

Symmetric molecules will not have any dipole moment
Hence (a) is the correct answer.