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# Which of the following aromatic substitution has zero dipolemoment?

$\begin{array}{1 1}(a)\;\text{Ortho-derivative}\\(b)\; \text{Para-derivative}\\(c)\;\text{Meta-derivative}\\(d)\;\text{None of the above}\end{array}$

Para derivative of the aromatic substitution has the zero dipole moment.
Hence (b) is the correct answer.