Explanation

Although benzene has three `(C=C)` bonds, it still does not react either with cold alkalin `KMnO_(4)` `(` Baeyer's test `)` or with hot alkaline `KMnO_(4)` or acidic `KMnO_(4)` or acidic `K_(2)Cr_(2)o_(7)` i.e., it does not udnergo oxidation due to the delocalisation of `pi bar(e) s. `
However,it undergoes ozonolysis reaction ue to the formation of tri `-` ozonides, thereby the delocalisation of `pi bar(e)s.` does not take place.