B2O3 + C + Cl2→A+B.A&B follows
,
This method is used for the preparation of halides of boron except for BF3.
Since borons oxidation state is '+3', it forms ′BCl3'
B2O3 + C + Cl2→A + B. A & B are?
B+CO2 → A+B. A & B are as follows