Question

Benzene cannot be iodinated with $I_2$ directly. However, in presence of oxidants such as $HN{O}_3$ , iodination is possible. The electrophiles formed in the case is

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

Answer 1

Answer: (A)

In the presence of oxidising agents such as $HN{O}_3$ direct, iodination of benzene is possible. The electrophiles formed in this case is $\left[I^{+}\right]$ .

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