Equal amount of an alkyl halide $\left({\mathrm{C}}_4{\mathrm{H}}_9\mathrm{C}\mathrm{l}\right)$ is reacted at the same temperature with equal volume of $0·2 \mathrm{M}$ and $0·4 \mathrm{M}$ solution of $\mathrm{K}\mathrm{O}\mathrm{H},$ respectively, in two separate experiments. The time taken for the reaction of 50% of $\left({\mathrm{C}}_4{\mathrm{H}}_9\mathrm{C}\mathrm{l}\right)$ was found to be same, the alkyl halide is

• A

  
• Correct answer
  B

  
• C

  
• D

  

Solution

Hydrolysis of $3°$ RX is independent of nucleophilic concentration $\left(\mathrm{S}{\mathrm{N}}^1\mathrm{}\mathrm{r}\mathrm{e}\mathrm{a}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\right).$

Hence, the correct answer is option: 'B'.