What is the product formed when tertiary alcohol is treated with alkaline $KMnO_4$ at elevated temperature?

A mixture of carboxylic acids

The correct answer is Option (3) → A mixture of carboxylic acids

When a tertiary alcohol is treated with alkaline KMnO₄ at elevated temperature, it undergoes oxidative cleavage (since it lacks an α-hydrogen).

This cleavage leads to the formation of a mixture of carboxylic acids.