MCQ
The most reactive towards $S_{N_1}$ is:
- A$\ce{PhCH_2Cl}$
- B$\text{PhCl}$
- ✓$\ce{PhCH(Cl)CH_3}$
- D$\ce{p−NO_2PhCH_2Cl}$
✓
Answer
Correct option: C.
$\ce{PhCH(Cl)CH_3}$
The rate of $S_{N_1}$ reaction depends upon the stability of the carbocation formed.
The compound given in option $C$ forms the most stable carbocation after removal of $Cl.$ This carbocation is most stable due to resonance, hyperconjugation and $+I$ effect of methyl group so it will react easily.
The compound given in option $C$ forms the most stable carbocation after removal of $Cl.$ This carbocation is most stable due to resonance, hyperconjugation and $+I$ effect of methyl group so it will react easily.
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