
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.

$I.$ $DDT$ $II.$ Gammerane
$III.$ Carbon tetrachloride $IV.$ Chlorobenzene
