Which of the given reactions is not an example of disproportionation reaction?

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Canvas Classes · Accepted Answer

Disproportionation = same element simultaneously oxidised and reduced.

Step 1 — Check each option:

(1) :
O in : ; in :  (reduced); in :  (oxidised)
Same element (O) both oxidised and reduced → Disproportionation ✓

(2) :
N in : ; in :  (oxidised); in :  (reduced)
Same element (N) both oxidised and reduced → Disproportionation ✓

(3) :
This is a half-reaction (reduction only). Only one species of Mn is present and it only gets reduced. No simultaneous oxidation of Mn → NOT disproportionation ✗

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