What is the decreasing order of reactivity amongst the following compounds towards aromatic electrophilic substitution
I. Chlorobenzene
II. Benzene
III. Anilinium chloride
IV. Toluene

Options

A. `I gt II gt III gt IV`
B. `IV gt II gt I gt III`
C. `II gt I gt IIIgt IV`
D. `III gt I gt II gt IV`

Answer

B

Explanation

Benzene becomes less reactive towards electrophilic substitution when deactivating groups like `-Cl, NH_2` etc. are present.
It becomes more reactive when activating group like `-CH_3` is present. `CH_3 `- donates via hyper conjugation, thereby activating the benzene ring weekly.