(C) The reaction involves the conversion of an amide $({C_6}{H_5}CONH_2)$ to a nitrile $({C_6}{H_5}CN)$ using $PCl_5$.$PCl_5$ acts as a dehydrating ag

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(C) The reaction involves the conversion of an amide $({C_6}{H_5}CONH_2)$ to a nitrile $({C_6}{H_5}CN)$ using $PCl_5$.$PCl_5$ acts as a dehydrating agent here,removing a molecule of water $(H_2O)$ from the amide group $(-CONH_2)$ to form the nitrile group $(-CN)$.Since a water molecule is removed,this process is known as dehydration.