Following reactions are involved in the preparation of chloroform:
CaOCl2+H2O→Ca(OH)2+Cl2
Then from alcohol,
CH3CH2OH+Cl2−2HCl−−−−→CH3CHOacetaldehyde+2HCl
CH3CHO+3Cl2→CCl3CHOChlorol or Trichloro acetaldehyde+3HCl (chlorination)
2CCl3CHO+Ca(OH)2→2CHCl3Chloroform (hydrolysis)
Phosgene (COCl2) doesn't form in the whole process.
Hence, the correct option is C.