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$(i)$ chlorobenzene is mono-nitrated to $M$
$(ii)$ nitrobenezene is mono-chlorinated to $N$
$(iii)$ anisole is mono-nitrated to $P$
$(iv)\, 2-$ nitrochlorobenzene is mono-nitrated to $Q.$
Out of $M, N, P$ and $Q$ the compound that undergoes reaction with $aq. NaOH$ fastest is