Which of the following reaction can produce $\mathrm{R}-\mathrm{CO}-\mathrm{Ar} ?$

Which of the following reaction can produce $\mathrm{R}-\mathrm{CO}-\mathrm{Ar} ?$
  1. $\mathrm{ArCOCl}+\mathrm{H}-\mathrm{Ar} \stackrel{\mathrm{AlCl}_{3}}{\longrightarrow}$
  2. $\mathrm{RCOCl}+\mathrm{ArMgX} \longrightarrow$
  3. $\mathrm{ArCOCl}+\mathrm{RMgX} \longrightarrow$
  4. $\mathrm{RCOCl}+\mathrm{H}-\mathrm{Ar} \stackrel{\mathrm{AlCl}_{3}}{\longrightarrow}$

Solution

ArCOR can be prepared by the combination of $\mathrm{ArH}+\mathrm{RCOCl}$ and not by $\mathrm{ArCOCl}+\mathrm{RMgX}$ because here the ArCOR formed will further react with $\mathrm{RMg} \mathrm{X}$ to form $3^{\circ}$ alcohol, $\mathrm{ArC}(\mathrm{OH}) \mathrm{R}_{2}$ as the final products. ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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