How proved that carbon is present in sugar?​

In all living organisms, in substances like carbohydrate, starch, urea etc. To prove sugar contains carbon, take a little amount of sugar in spoon and heat it gently till it melts and turned into yellowish color. On further heating it changes into brown colored mass and then black, which is charcoal.

sugar treated with strong sulphur acid turns to black

Explanation: sulphur acid removes water from sugars and carbon is left in residue.

This should not to try at home. Water boils when high temperature is achieved.

Also smell of burned sugar occurs

distance, luminosity, brightness, radius, chemical composition, and temperature