Which of the following reagents is used in Gatterman-Koch formylation of arene?

Which of the following reagents is used in Gatterman-Koch formylation of arene?
  1. $\mathrm{CO}, \mathrm{HCl} / \mathrm{AlCl}_3$ (anhydrous)
  2. $\mathrm{CrO}_2 \mathrm{Cl}_2, \mathrm{CS}_2$
  3. $\mathrm{CrO}_3$
  4. $\mathrm{Cl}_2 / \mathrm{hv}, \mathrm{H}_3 \mathrm{O}^{+}$

Solution

$\mathrm{CO}, \mathrm{HCl} / \mathrm{AlCl}_3$ (anhydrous)

Asked in: MHT CET 2022 (08 Aug Shift 1)

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