What is the product when glucose reacts with bromine water?

Gluconic acid

The correct answer is Option (1) → Gluconic acid

Glucose is an aldose sugar, meaning it has an aldehyde group (-CHO) at the first carbon. Bromine water (Br₂ in water) is a mild oxidizing agent and selectively oxidizes the aldehyde group (-CHO) in glucose to a carboxylic acid group (-COOH) without affecting the other functional groups (like the hydroxyl groups).

Thus, when glucose reacts with bromine water, the aldehyde group at the C1 position of glucose is oxidized to form gluconic acid:

Other Options:

Glyceraldehyde: This is a three-carbon aldehyde sugar and is unrelated to this reaction.

Saccharic acid: This is formed when glucose is oxidized using stronger oxidizing agents like nitric acid, which oxidizes both the aldehyde and the terminal hydroxyl group.

Oxime: This is formed when an aldehyde or ketone reacts with hydroxylamine (NH₂OH), not bromine water.

Summary:

The product of the reaction between glucose and bromine water is gluconic acid.