Which is the intramolecular oxidation-reduction reaction ?

K+1 Cl+5 O3-2 →K+1 Cl-1  +3O02Cl is reduced and O is oxidized.(N-3H4)2 Cr+62 O7 →N02 +Cr+32O3N is oxidized and Cr is reduced.P+5 Cl5-1 → P+3Cl3 + Cl02P is reduced and Cl is oxidized.