Exams › JEE Advanced › Chemistry

When lactose is subjected to acid hydrolysis (H2O / H+), the products obtained are:

1. D-Galactose only
2. D-Glucose and D-Galactose
3. D-Glucose and D-Fructose
4. D-Fructose only

Correct answer: D-Glucose and D-Galactose

Solution

Lactose (milk sugar) is a disaccharide consisting of D-galactose linked to D-glucose via a beta-1,4-glycosidic bond. Acid hydrolysis cleaves this bond to yield equimolar D-glucose and D-galactose.

Related JEE Advanced Chemistry questions

• How many phenylhydrazine molecules are required to react with one glucose molecule to form an osazone?
• What is the total number of asymmetric carbon atoms present in a 2-ketohexose molecule?
• Which of the following amino acids contains a secondary (2 degrees) amino group in its structure?
• D-Glucose (an aldohexose with structure CHO-(CHOH)4-CH2OH) is treated with NaBH4. How many optically active isomers of the product are possible?
• A decapeptide has a molecular weight of 796. On complete hydrolysis it yields glycine (molecular weight 75), alanine, and phenylalanine as the only products. If glycine contributes 47.0% of the total weight of all hydrolysis products, how many glycine units are present in the decapeptide?
• How many chiral centres are present in the structure of penicillin G (benzylpenicillin)?

⚔️ Practice JEE Advanced Chemistry free + battle 1v1 →