Is barley a disaccharide

No, barley is not a disaccharide; it is a whole grain. Barley primarily contains starch, which is a polysaccharide made up of many glucose units. Disaccharides, such as sucrose or lactose, consist of two monosaccharide units. Barley can break down into simpler sugars during digestion, but it itself is not classified as a disaccharide.