Question

what is disproportionation reaction???​

Answer 1

the reaction in which oxidation and reduction take place simultaneously is known as disproportionation reaction

Answer 2

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$\huge{\red{\mathfrak{ANSWER:-}}}$

A disproportionation reaction is when a multiatomic species whose pertinent element has a specific oxidation state gets oxidized and reduced in two separate half-reactions, yielding two other products containing the same pertinent element. 

A convenientexample is Mn2O3 becoming Mn2+ and MnO2.