Practicing Success

Target Exam

CUET

Subject

Chemistry

Chapter

Organic: Biomolecules

Question:

Complete the following reaction:

\((C_6H_{10}O_5)_n\, \ + \, \ H_2O \overset{H^+}{\underset{393 K, 2-3 atm }{\longrightarrow}}?\)

Options:

\(n C_6H_{12}O_6\)

\(nC_{12}H_{22}O_{11}\)

\(n C_2H_4O_2\)

\(n CHO\)

Correct Answer:

\(n C_6H_{12}O_6\)

Explanation:

The correct answer is option 1. \(n C_6H_{12}O_6\).

The reaction involves the hydrolysis of a polysaccharide, where \( (C_6H_{10}O_5)_n \) represents a generic formula for a polysaccharide, such as cellulose or starch, and \( H_2O \) is water.

In the presence of \( H^+ \) (protons), typically in the form of an acid catalyst, and under specific conditions of temperature and pressure (393 K, 2-3 atm), polysaccharides undergo hydrolysis to break down into their constituent monosaccharide units.

The hydrolysis of polysaccharides involves the breaking of glycosidic bonds between the individual sugar units, resulting in the formation of monosaccharides.

The complete hydrolysis of a polysaccharide yields multiple molecules of monosaccharides. For example, if we consider the hydrolysis of cellulose, a common polysaccharide found in plants, it would yield glucose molecules as the monosaccharide units.

So, the complete reaction can be represented as:

\[ (C_6H_{10}O_5)_n + nH_2O \overset{H^+}{\underset{393 K, 2-3 atm }{\longrightarrow}} nC_6H_{12}O_6 \]

Where \( n \) represents the degree of polymerization, indicating the number of repeating units in the polysaccharide. The hydrolysis reaction breaks down the polysaccharide into \( n \) molecules of the monosaccharide \( C_6H_{12}O_6 \) (glucose).