how to distinguish between Acetophenone and benzophenone

due to presence  of methyl carbonyl acetophenone gi-ve  idoform test with I2 and NaOH

bromobenzene into phenyl ethanol

first convert into grignard reagent with Mg then react with Acetaaldehyde which give 1-phenyl ethanol

Ethyl amine convert into ethyl isocyanide

C2H5NH2+HNO2 convert into alcohal then react with socl2 and AgCN finally convert into isocynide