Q. 23

Complete the foll

Answer :

(i) When benzaldehyde is treated with sodium cyanide in acidic medium it undergoes addition reaction to give benzene cyanohydrin.



(ii) the given reaction is an example of electrophilic substitution. Here Cd element is replaced by two moles of acetyl chloride to give benzylmethyl ketone or 1-phenylpropan-2-one.



OR


(i) Propane when treated with with Ba(OH)2 undergoes Aldol condensation to give a ketol product.


Rxn:



(ii) Acetophenone is treated with Zn(hg)/con. HCl


Aldehyde and ketone when treated with Zn (Hg) along with conc. HCl it undergoes reduction to give ethyl benzene.



This reaction is also called as Clemmensen reduction.


(iii) Benzoyl chloride undergoes partial reduction as the poisoned catalyst reduces the activity of palladium and thus it gives benzaldehyde as the product.


Rxn:



The above reaction is called as Rosenmund reaction, and the catalyst used is called Lindlar’s catalyst.

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