Question

The reactivity order of the following molecules towards SN1 reaction is:
Allyl chloride (I), Chlorobenzene (II), Ethyl chloride (III)

• A. I>II>III
• B. I>III>II
• C. II>I>III
• D. III>I>II

Answer 1

The Correct Option is D

The reactivity order towards an \(S_N1\) reaction is determined by the stability of the carbocation intermediate.

Allyl chloride forms an allyl carbocation, which is resonance-stabilized, making it more stable.

Ethyl chloride forms a primary carbocation, which is less stable than the allyl carbocation.

Chlorobenzene, however, does not undergo \(S_N1\) reactions readily because the carbocation would be destabilized due to the aromatic ring.

Thus, the reactivity order is III>I>II.