Question

Pottassium cannot be kept under benzene

Answer 1

though potassium is highly reactive metal. it used to kept in kerosene. if it is kept with benzene, explosion will happen.

Answer 2

Usually, non-polar solvents like kerosene are used for storing alkali metals or substances.

Benzene is a polar solvent which reacts with sodium or Potassium very vigorously. It is very expensive, has a low boiling point, and is very toxic too. Since it has low bp, it can easily get evaporated.

When Potassium in any form for eg. KMnO₄ (Potassium permanganate) comes in contact with Benzene, there is an immediate oxidation reaction, which results in the formation of benzoic acid.