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What is the disproportionation reaction of ##MgCl##?
There is no disproportionation reaction.
Magnesium has only two : 0 and +2.
Hence, there is no such compound as ##"MgCl"##, in which ##"Mg"## would have an oxidation number of +1.
Even if you meant ##"MgCl"_2##, it still wouldn’t disproportionate.
In a disproportionation reaction, ##"Mg(+2)"## could be reduced to ##"Mg(0)"##, but it would also have to be oxidized to some higher oxidation number, and such a number does not exist.
Therefore, there is no disproportionation reaction.