Target Exam

CUET

Subject

Chemistry

Chapter

Organic: Biomolecules

Question:

Read the passage carefully and answer the questions.

Biomolecules are the organic compounds present as an essential constituents of living organisms in different cells. The molecules are generally termed as macromolecules, which are carbohydrates, enzymes, nucleic acids, amino acids and proteins etc. Carbohydrates are classified as sugars and non-sugars include sucrose, glucose, fructose, starch and cellulose. Enzymes are coordinated with various chemical reactions in nucleic acid. Nucleic acids are found in living organisms made up of proteins and natural polymers. Two types that are generally found in biological systems are DNA and RNA nucleic acid. Amino acids are bifunctional groups of carboxyl and amino groups. Proteins are a class of biologically important compounds. They are crucial to virtually all processes in living systems. Some of them are hormones, which serve as chemical messengers that coordinate certain biochemical activities.

Cane sugar on boiling with $HCl$ or $H_2SO_4$ hydrolysis yields

Options:

Two molecules of glucose

1:1 mixture of Glucose and Fructose

Two molecules of fructose

No Reaction

Correct Answer:

1:1 mixture of Glucose and Fructose

Explanation:

The correct answer is Option (2) → 1:1 mixture of Glucose and Fructose

Sucrose (Cane sugar): If sucrose is boiled with dilute $HCl$ or $H_2SO_4$ in alcoholic solution, glucose and fructose are obtained in equal amounts.

$ \text{C}_{12}\text{H}_{22}\text{O}_{11}+\text{H}_2\text{O}\overset{{\text{H}^{+}}}{\longrightarrow}\text{C}_6\text{H}_{12}\text{O}_6+\text{C}_6\text{H}_{12}\text{O}_6 $

$ \text{Sucrose}\quad\longrightarrow{\quad}\text{Glucose}\;+\;\text{Fructose} $