Hilbert space of isomorphic representations of bosonized chiral QCD(2)

We analyze the Hilbert space structure of the isomorphic gauge noninvariant and gauge-invariant bosonized formulations of chiral QCD, for the particul ar case of the Jackiw-Rajaraman parameter a = 2. The BRST subsidiary condit ions are found not to provide a sufficient criterium for defining physical states in the Hilbert space and additional superselection rules must be tak en into account. We examine the effect of the use of a redundant field alge bra in deriving basic properties of the model. We also discuss the constrai nt structure of the gauge-invariant formulation and show that there are onl y primary constraints, and they are first-class.