Question

some juice packages carry the warning do not drink if package is swollen name the process that leads to the swelling

Answer 1

Fermentation results in formation of carbon dioxide which causes the pack to get puffed
If the juice is fermented then the sugar in it will be change into alcohol

Answer 2

The process is known as fermentation.

It is the process in which there is some chemical changes in substrates ( organic) by the action of several enzymes leading to the production of alcohol.

Juices contain sugars like glucose, sucrose, etc. that get fermented to alcohol

and carbon dioxide( as a by-product) in the presence of yeast.

Hence, it destroys the juice and makes it unfit for consumption once it gets fermented.