). Which can be used for carring out electrophilic aromatic substitution? (a) Water (b) Liq N13 Oleum (d) Hydride ion

). Which can be used for carring out electrophilic aromatic substituti

1.	). Which can be used for carring out electrophilic aromatic substitution? (a) Water (b) Liq N13 Oleum (d) Hydride ion
Answer» tion:22-4A Scope and MechanismIn this section we shall be mainly interested in the reactions of arenes that involve attack on the carbon ATOMS of the aromatic ring. We shall not elaborate now on the reactions of substituent groups around the ring.The principal types of reactions INVOLVING aromatic rings are substitution, addition, and oxidation. Of these, the most COMMON type is electrophilic substitution. A summary of the more important substitution reactions of benzene is given in Figure 22-7. Many of the reagents used to achieve these substitutions will be familiar to you in connection with electrophilic addition reactions to alkenes (e.g., Cl2 , Br2 , H2SO4 , and HOCl ; Section 10-3). Electrophilic addition to alkenes and electrophilic aromatic substitution are both polar, stepwise processes, and the key step for each is attack of an electrophile at carbon to form a cationic intermediate.