Which of the following is an example of an organic molecule?

The correct answer is glucose because it is a complex organic molecule composed primarily of carbon, hydrogen, and oxygen atoms, which are essential components of all organic compounds. Glucose is a monosaccharide, often referred to as blood sugar, and is a significant energy source for living organisms. Being an organic molecule, it plays a crucial role in biological processes, such as cellular respiration and energy storage in living organisms.

In contrast, carbon dioxide, sodium chloride, and water do not fit the criteria for organic molecules. Carbon dioxide is an inorganic compound consisting of carbon and oxygen atoms, while sodium chloride (table salt) is an ionic compound formed from sodium and chlorine, which are also classified as inorganic. Water, while vital for life and a polar molecule, does not contain carbon and therefore is also classified as inorganic.