Gattermann-Koch reaction: reagent and product from benzene

1. A.
   $\text{C}_6\text{H}_5\text{COOH}$
2. B.
   $\text{C}_6\text{H}_5\text{CHO}$
3. C.
   $\text{C}_6\text{H}_5\text{CHCl}_2$
4. D.
   $\text{C}_6\text{H}_5\text{Cl}$

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1. A.
   CrO$_3$
2. B.
   CO, HCl/AlCl$_3$ (anhyd.)
3. C.
   CrO$_2$Cl$_2$, CS$_2$
4. D.
   Cl$_2$/h$\nu$, H$_3$O$^+$

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1. A.
   $AlH(i - Bu)_{2}$
2. B.
   $CO,HCl$ (anhyd. ${AlCl}_{3}$)
3. C.
   ${CrO}_{2}{Cl}_{2}\left( {CS}_{2} \right)$
4. D.
   $DIBAl - H$

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