Final answer:
Option A) C6H12O6 is the chemical formula for glucose, a hexose monosaccharide and an example of a carbohydrate with a carbon to hydrogen to oxygen ratio of 1:2:1.
Step-by-step explanation:
The student's question, "Which is likely a carbohydrate? A) C6H12O6 B) C6H6O12 C) C12H6O6 D) C6N12O6," pertains to identifying a compound that is most likely a carbohydrate based on its molecular formula. Among the given options, A) C6H12O6 is the chemical formula for glucose, which is a hexose monosaccharide. Carbohydrates can typically be identified by their general formula (CH2O)n, which signifies a 1:2:1 atomic ratio of carbon, hydrogen, and oxygen. Glucose fits this description and is an important energy source for cells, sometimes bonding with proteins to form glycoproteins or with lipids to form glycolipids which are part of cell membranes.