1.

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

Answer»

Solution :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`


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