Question

Benzene cannot be iodinated with $I_{2}$ directly. However, in presence of oxidants such as $HNO_{3}$ , iodination is possible. The electrophiles formed in the case is

• A. $\left[I^{+}\right]$
• B. $\left[I^{-}\right]$
• C. $\left[\overset{\text{+δ}}{\text{I}} ...... \overset{\text{+δ}}{\text{O}} \text{H}_{\text{2}}\right]^{\text{+}}$
• D. $\left[\overset{- \text{δ}}{\text{I}} ...... \overset{- \text{δ}}{\text{O}} \text{H}_{\text{2}}\right]^{\text{+}}$

Answer 1

Answer: (A)

In the presence of oxidising agents such as $HNO_{3}$ direct, iodination of benzene is possible. The electrophiles formed in this case is $\left[I^{+}\right]$ .

$\text{H}^{\text{+}} \, \text{+} \, \text{HNO}_{\text{3}} \, \text{+} \, \frac{\text{1}}{\text{2}} \text{I}_{\text{2}} \rightarrow \underset{\text{Iodine} \, \text{cation}}{\text{I}^{\text{+}}} \, \text{+} \, \text{NO}_{\text{2}} \, \text{+} \, \text{H}_{\text{2}} \text{O}$