| LIST I | LIST II | ||
| A. | KMnO4 | I. | Orange |
| B. | K2Cr2O7 | II. | Green |
| C. | K2CrO4 | III. | Yellow |
| D. | K2MnO4 | IV. | Purple |
Consider the following reaction:
\[ A + NaCl + H_2SO_4 \xrightarrow[\text{Little amount}]{} CrO_2Cl_2 + \text{Side products} \] \[ CrO_2Cl_2(\text{Vapour}) + NaOH \rightarrow B + NaCl + H_2O \] \[ B + H^+ \rightarrow C + H_2O \]
The number of terminal 'O' present in the compound 'C' is ________.