Answer :

(i) When Benzaldehyde reacts with NaCN/HCl in basic medium i.e. 9-10, CN- as a nucleophile will attack on aldehyde group of benzene, and the obtained product is as below


(ii) When Acetyl Chloride reacts with (C6H5-CH2)2Cd then C6H5-CH2- as a nucleophile will attack on C which is connected with Oxygen group and will replace Cl atom.



(iv) Below reaction is also known as Hell Volhard Zelinsky reaction, in which Br will add on tertiary carbon group because of formation of carbocation at the central atom C.



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