
Correct order is :
$( i ) < ( ii ) < ( iii ) < ( iv )$
More No. of $NO _{2}$ substituted aromatic halide, increase the rate of nucleophile substitution reaction in aromatic halides.
$[Figure]$ $\xrightarrow[{Heat}]{{NaOC{H_3}\left( {1\,eq.} \right)}}$


