Answer
Please see the work below.
Work Step by Step
We can show the formulas along with the oxidation number of the required compounds as follows:
+1 oxidation number state $Cl_2O$
+3 oxidation number state $Cl_2O_3$
+4 oxidation number state $ClO_2$
+6 oxidation number state $Cl_2O_6$
+7 oxidation number state $Cl_2O_7$