Question

The correct statement regarding the mechanism involved in the above reactions is

• A. In both I, II C--Cl bond is cleaved in slow step of the reaction
• B. In both I, II C--Cl bond is cleaved in fast step of the reaction
• C. In I C--Cl bond is cleaved in slow step and in II fast step of the reaction
• D. In I C--Cl bond is cleaved in fast step and in II slow step of the reaction

Hint:

In SN1, bond cleavage is rate-determining; in aryl systems with EWGs, the reaction can proceed faster.

Answer 1

The Correct Option is C

In the SN1 mechanism (reaction I), the C--Cl bond breaks in the slow step, forming a carbocation. In reaction II (aromatic nucleophilic substitution), the presence of strong electron-withdrawing groups facilitates faster bond cleavage.