Which of the following benzene rings is most reactive towards an electrophile $(E^{\oplus})$?

What is meant by activating groups? Explain with suitable examples.

What is the product of the following reaction?
$C_6H_6 + CH_2=CH_2 \xrightarrow{HCl, AlCl_3} \text{Product}$

Identify correct statement/s :
$(A)$ $-OCH_3$ and $-NHCOCH_3$ are activating groups
$(B)$ $-CN$ and $-OH$ are meta directing groups
$(C)$ $-CN$ and $-SO_3H$ are meta directing groups
$(D)$ Activating groups act as ortho- and para-directing groups
$(E)$ Halides are activating groups
Choose the correct answer from the options given below :

In electrophilic aromatic substitution reaction,the nitro group is meta-directing because it

Answer the following questions: What is the electrophile in the sulphonation reaction of benzene? And how is it obtained?