The following reagent is used for introducing a formyl group (—CHO) into the benzene ring

Question

The following reagent is used for introducing a formyl group (—CHO) into the benzene ring (A)  CO + HCl  (B)  HCN + HCl  (C) Both (a) and (b) (D) None of the above

Tardigrade Admin · Accepted Answer

Gattermann-Koch formyladon When a mixture of

CO

and

H Cl

gas is passed through a solution of benzene in the presence of anhydrous

A lC l_{3}

and

C u Cl

, benzaldehyde is formed.

CO + H Cl \to formyl chloride [H COCl]

If

CO

in this reaction is replaced by

H CN

, the reaction is called Gattermann formylation.

If CO in this reaction is replaced by HCN, the reaction is called Gattermann formylation.

Q. The following reagent is used for introducing a formyl group $(— C H O)$ into the benzene ring

$CO + H Cl$

$H CN + H Cl$

Both $(a)$ and $(b)$

None of the above

Q. The following reagent is used for introducing a formyl group (—CHO) into the benzene ring

CO+HCl

HCN+HCl

Both (a) and (b)

None of the above

Gattermann-Koch formyladon When a mixture of CO and HCl gas is passed through a solution of benzene in the presence of anhydrous AlCl3​ and CuCl, benzaldehyde is formed. CO+HCl→formyl chloride[HCOCl]​ If CO in this reaction is replaced by HCN, the reaction is called Gattermann formylation.

Q. The following reagent is used for introducing a formyl group $(— C H O)$ into the benzene ring

$CO + H Cl$

$H CN + H Cl$

Both $(a)$ and $(b)$