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# Which of the following is best choice of reagents for the electrophilic iodination of an aromatic ring?

(a) KI / Acetone

(b) $I_2$/ $CH_3CN$

(c) KI /  $HNO_3$

(d) $I_2/HNO_3$

Toolbox:
• In organic chemistry, an electrophilic aromatic halogenation is a type of electrophilic aromatic substitution. This organic reaction is typical of aromatic compounds and a very useful method for adding substituents to an aromatic system.
• Halogenation of phenols is faster in polar solvents due to the dissociation of phenol, with phenoxide ions being more susceptible to electrophilic attack as they are more electron-rich.
Iodine in acid medium will easily generate the electrophile I+.
Hence (d) is the correct answer.
edited Mar 29, 2014