Question

Rank the following compounds in order of decreasing reactivity towards electrophilic substitude reaction
I) Chlorobenzene II) 4-Nitrochlorobenzene
III) 2,4-dinitrochlorobenzene IV) 2, 4, 6-trinitrochlorobenzene

• A. I > II > III > IV
• B. I > III > II > IV
• C. III > I > IV > II
• D. IV > III > II > I

Answer 1

The correct option is A I > II > III > IV

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$-N{O}_2$ is a deactivating group while $C{l}^{⊝}$ is a strong activating group. Greater the electron density on Benzene higher will be the rate of electrophilic substitution reaction. So, the correct order is

$I>II>III>IV$