How could you tell if a molecule is a carbohydrate?
If the molecule has carbon, hydrogen, and oxygen, and has a ratio of 2:1 of hydrogen and oxygen like in water; then most likely it’s a carbohydrate.
Carbohydrates are also known as saccharides in biochemistry and in addition to the other answers, carbohydrates include sugars as well. So if you come across a substance with an -ose ending, it is a sugar and therefore a carbohydrate.
ex. sucrose, glucose, ribose…