Recall the disproportionation of chglorine and the chlorate 1 ionWatch
does it mean?
CL2 + 2OH- ---> CL- + OCL- +H20
Chlroine gets both oxisded and reduced?
cl2 ---> cl-
0 ---- -1 which is reduction?
cl2 ---> ocl-
o---> +1 which is oxidsation
all you have to remember is that disproportionation is the simultaneous oxidation and reduction of an element (and therefore the element must have at least 3 oxidation states)