The decreasing order of reactivity towards electrophilic substitution reaction of the following compounds is:
(i) benzene,
(ii) chlorobenzene,
(iii) nitrobenzene,
(iv) toluene

Arrange the following compounds in the order of decreasing reactivity towards electrophilic substitution reaction.

($\mathrm{I}$) 

($\mathrm{II}$) 

($\mathrm{III}$) 

($\mathrm{IV}$) 

Give the order of decreasing reactivity towards an electrophile.

$1.$ 

$2.$

$3.$

$4.$

$5.$

The major product obtained in the following is:

The products formed in the above reaction is:

Compound $\mathrm{A}$ is?