MCQ
The conversion, $PhCN \to PhCOCH_3,$ can be achieved most conveniently by reaction with
- ✓$CH_3MgBr$ followed by hydrolysis
- B$I_2 - NaOH, CH_3I.$
- Cdil. $H_2SO_4$ followed by reaction with $CH_2N_2$
- D$LAH$ followed by reaction with $CH_3I$

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(Given : $R =0.083\, L\, bar \,K ^{-1} \,mol ^{-1}$ )
Statement $(I)$ : $\mathrm{S}_{\mathrm{N}} 2$ reactions are 'stereospecific', indicating that they result in the formation only one stereo-isomers as the product.
Statement $(II)$ : $\mathrm{S}_N 1$ reactions generally result in formation of product as racemic mixtures. In the light of the above statements, choose the correct answer from the options given below :
$(I)$ Mond's process for purification of nickel
$(II)$ Removal of unreacted $AgBr$ from photographic plate
$(III)$ Removal of lead poisoning from the body
$I$ $-$ $II$ $-$ $III$