Which of the following reactions can produce R - CO - Ar?

1.	Which of the following reactions can produce R - CO - Ar?
Answer» `ArCOCl + H - AR overset(AlCl_(3))rarr` `COCl + RMg X rarr` `R + CrO_(3) rarr` `RCOCL + H - Ar overset(AlCl_(3))rarr` SOLUTION :`RCOCl + Ar - H overset(AlCl_(3))rarr R - overset(O)overset(\|\|)(C) - Ar + HCL`

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