Which of the following reaction are addition reaction?

The following reaction is an example of 

Normally, benzene gives electrophilic substitution reaction rather than electrophilic addition reaction although it has double bonds. Explain why?

Which of the following benzene rings contain deactivating groups? 

Which of the following benzene rings contain $\mathrm{o}-\mathrm{p}$ directing groups?

Arrange the following in decreasing order of their reactivity with an electrophile.

	(I)	(II)	(III)
a
b
c
d