What is the major product of the following reaction?

Which of the following will undergo sulphonation at the fastest rate?

When excess $C_6H_6$ is reacted with $CH_2Cl_2$ in the presence of anhydrous $AlCl_3$,which of the following products is obtained?

Which of the following is not an aromatic compound?

For the electrophilic aromatic substitution reaction on the benzene ring,the substituents are $-CH_3$,$-CH_2Cl$,$-CHCl_2$,and $-CCl_3$. What is the increasing order of reactivity towards electrophilic substitution?

The major product formed in the following reaction sequence is:
$C_6H_5-CHBr-CH_2Br$ $\xrightarrow[(ii) NaNH_2]{(i) alc. KOH}$ $\xrightarrow[(iii) \text{Red hot iron tube}, 873 K]{}$