What is the evidence of a positive test when KMnO4 were used? Write down a complete balanced reaction for oxidation of methanol with KMnO4 ?

The evidence of a positive test when KMnO4 is used is the change in color of the solution. KMnO4 is a purple-colored compound, and when it is reduced during a reaction, it changes to a colorless solution.

The balanced reaction for the oxidation of methanol with KMnO4 is as follows:

2 KMnO4 + 3 CH3OH → 2 MnO2 + 3 H2O + 3 HCHO + 2 KOH

This reaction shows the oxidation of methanol (CH3OH) to formaldehyde (HCHO) with the reduction of KMnO4 to MnO2.

Evidence of a positive test when KMnO4 was used:

- Formation of a brown precipitate of MnO2 (manganese dioxide).

Complete balanced reaction for oxidation of methanol with KMnO4:

2KMnO4 + 5CH3OH + 3H2SO4 → 2MnSO4 + 5HCHO + K2SO4 + 8H2O