Dear Student,.. C) Cl2O6 is a mixed anhydride.... mixed anhydride are the compound that react with water to form a mixture of two acidic anhydride.....For eg:....1)2NO2 + H20---> HNO2 + HNO3..... 2)..2CLO2 + H2O--->HCLO2 + HCLO3...... 3)..CL2O6 + H20-->HCLO3 + HCLO4.....Regards......