Consider the following reactions,
A+NaClLittle amount+H2SO4→CrO2Cl2+Side products
CrO2Cl2 (Vapour)+NaOH⟶B+NaCl+H2O
B+H+⟶C+H2O
The number of terminal 'O' present in the compound 'C' is ________ [2025]