if a reaction is a disproportionation reaction does that mean it is always a redox reaction?
This reaction changes the oxidation state of two reactants in that way that one reactant is the reducing and the other one the oxidizing agent in that mechanism. Yes, its always redox reaction!
if a reaction is a disproportionation reaction does that mean it is always a redox reaction?
The definition of a disproportionation reaction you need to learn at A level is "a reaction in which an element in a single species is simultaneously oxidised and reduced". A redox reaction is a reaction in which reduction and oxidation both occur (hence the name). Therefore all disproportionation reactions must be redox reactions, but you should note that not all redox reactions are disproportionation reactions.