How is benzoyl chloride converted into benzaldehyde. Write the equation and name the reaction.

Explanation

Benzoyl chloride is hydrogenated over catalyst, palladium on barium sulphate, Benzaldehyde is formed. This reaction is calle Rosenmund reduction.

(b) Grignard reagent reacts with dry ice (solid `CO_(2)`) to form an addition product
`RMgX + CO_(2) overset("Dry ether")rarr R-overset(O)overset(||)(C )-OMgX`
Addition product which on acid bydrolysis gives carboxylic acid.
`R-overset(O)overset(||)(C )-OMgX underset(H_(2)O)overset(H^(+))rarr RCOOH + Mg(OH)X`
(c ) Complete the reaction

`CHX_(3) + RCOONa`
(a) Conversion of benzoyl chloride into benzaldehyde :
The reaction is called Rosenmund.s reduction. In this reaction `H_(2)(g)` is passed over benzoyl chloride using `Pd//BaSO_(4)` in boiling xylene.

(b)
(c ) `underset("alkyl methyl ketone)")(R-underset(O)underset(||)(C)-CH_(3)) overset(NaOX)rarr underset("(Trihalo-ketone)")(R-underset(O)underset(||)(C)-C.X(3))+3NaOH`