AIPMT – 2002

HINT: On oxidation both gives different products.

Explanation: 

On treating n-propyl alcohol with acidified potassium dichromate, we get an aldehyde.  

On treating secondary alcohol with potassium dichromate in an acidic medium, it acts as an oxidation agent and gives propanone (ketone) as the product.

Ozonolysis is the addition of Oxygen to alkenes or alkynes and making it saturated. Therefore, it cannot be used to distinguish between them.