MCQ
$S_{N_1}$ reaction is favoured by:
- ANon$-$polar solvents
- ✓Bulky group on the carbon atom attached to the halogen atom.
- CSmall groups on the carbon atom attached to halogen atom.
- DAll the above
✓
Answer
Correct option: B.
Bulky group on the carbon atom attached to the halogen atom.
$S_{N_1}$ mechanism proceeds through carbocation formation and as stability of carbocation increases, it favours $S_{N_1}$ mechanism.
And as we add bulky group to carbon attached with halogen, carbocation formed will become more stable due to $+I$ effect of bulky alkyl group so it favours $S_{N_1}$ mechanism.
And as we add bulky group to carbon attached with halogen, carbocation formed will become more stable due to $+I$ effect of bulky alkyl group so it favours $S_{N_1}$ mechanism.
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