Which one of the following is a compound ?

In chemistry, a compound is a substance composed of two or more elements chemically combined in a fixed ratio, possessing properties distinct from its constituent elements. Sugar (specifically sucrose) is a pure substance and a carbohydrate compound with the chemical formula C12H22O11 [t2][t10]. In contrast, milk is a complex mixture containing water, fats, proteins, and lactose [t6]. Tea and coffee are infusions, which are classified as mixtures of various soluble solids, volatile compounds, and plant extracts [t1][t4][t7][t9]. While the components of a mixture retain their individual properties and do not react chemically, a compound like sugar consists of identical particles where the elements are chemically bonded [c1][c3]. Therefore, among the given options, only sugar qualifies as a chemical compound, whereas the others are heterogeneous or homogeneous mixtures.

Sources

1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 8: Nature of Matter: Elements, Compounds, and Mixtures > Snapshots > p. 130
2. [2] https://www.sciencedirect.com/topics/neuroscience/sucrose