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Solution


Q.

Choose the halogen which is most reactive towards SN1 reaction in the given compounds (A, B, C and D)             [2023]
1 A-Br(a); B-I(a); C-Br(b); D-Br(a)  
2 A-Br(b); B-I(a); C-Br(a); D-Br(a)  
3 A-Br(b); B-I(b); C-Br(b); D-Br(b)  
4 A-Br(a); B-I(a); C-Br(a); D-Br(a)  

Ans.

(1)

The reactivity of halogen for SN1 reaction depends upon stability of carbocation:

A – Br(a)⇒ Phenyl carbocation

B – I(a)⇒ Allyl carbocation

C – Br(b)⇒ 3° – carbocation

D – Br(a)⇒ 3° – carbocation