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

Why following organic chlorides will not give a Friedel-Craft alkylation product when heated with benzene and ${\mathrm{AlCl}}_3$?

Give the major product of monobromination of following compounds.

Predict the product of the reaction given below:

${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CH}={\mathrm{CH}}_2\frac{\mathrm{HBr}}{\text{ Peroxide or light }}$

${\mathrm{CH}}_2=\mathrm{CH}-{\mathrm{CH}}_2-{\mathrm{CH}}_3\stackrel{\mathrm{NBS}}{⟶}\mathrm{B}+\mathrm{C}$

Write structure of $\mathrm{B}$ and $\mathrm{C}$.

What will be the order of reactivity of the following compounds towards addition of $\mathrm{HBr}$ ?