Solve this following

Question:

Increasing rate of $S_{N} 1$ reaction in the following compounds is :

 

  1. $(\mathrm{A})<(\mathrm{B})<(\mathrm{C})<(\mathrm{D})$

  2. $(\mathrm{B})<(\mathrm{A})<(\mathrm{D})<(\mathrm{C})$

  3. $(\mathrm{B})<(\mathrm{A})<(\mathrm{C})<(\mathrm{D})$

  4. $(\mathrm{A})<(\mathrm{B})<(\mathrm{D})<(\mathrm{C})$

Correct Option: , 3

Solution:

Rate of $\mathrm{S}_{\mathrm{N}^{*}}$ is directly proposional to stability of first formed carbocation so answer is

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