Answer:
B. C-N
Explanation:
Carbohydrates are bio-molecules which are basically made up of three elements named as carbon (C), hydrogen (H) and oxygen (O) so they will have bonds like C-C, C-H & C-O but will not have C-N bond.
Carbohydrates mainly serve the function of providing energy to the body. The energy lies in the the chemical bonds of carbohydrate molecules which is released when the these bio-molecules are oxidized in the presence of air.
Carbohydrates can exist as monosaccharides, disaccharides or polysaccharides.
Monosaccharides like glucose and fructose are the simplest and instant source of energy.
Disaccharides are sucrose, maltose, and lactose.
Polysaccharides like glycogen (in animals) and starch (in plants) are used for the storage of carbohydrates so that they could be used for energy in future.
