Question

Given below are two statements : 
Statement I : Wet cotton clothes made of cellulose based carbohydrate takes comparatively longer time to get dried than wet nylon polymer based clothes. 
Statement II : Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes. 
In the light of the above statements, choose the Correct answer from the options given below

• A. Statement I is false but Statement II is true
• B. Statement I is true but Statement II is false
• C. Both Statement I and Statement II are true
• D. Both Statement I and Statement II are false

Hint:

Understand the chemical structures of cellulose (cotton) and nylon, focusing on the presence and availability of hydrogen bonding sites (hydroxyl and amide groups). The extent of hydrogen bonding with water molecules determines the water retention capacity of the fabric and consequently its drying time.

Answer 1

The Correct Option is B

To determine the correct answer, we need to analyze each statement individually in the context of the material properties of cotton and nylon:

1. Statement I: Wet cotton clothes made of cellulose-based carbohydrate take comparatively longer time to get dried than wet nylon polymer-based clothes.
   • Cotton is a natural fiber composed of cellulose, which has a high capacity for absorbing water due to the presence of hydroxyl groups (\(\text{-OH}\)) that form hydrogen bonds with water molecules.
   • Nylon, on the other hand, is a synthetic polymer made from repeating units linked by amide bonds. It does not absorb as much water as cotton due to its lower ability to form hydrogen bonds with water.
   • Given this difference in the ability to absorb water, cotton typically takes longer to dry than nylon. Thus, Statement I is true.
2. Statement II: Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes.
   • Cotton is known for its high water absorbency due to the high number of hydroxyl groups that can form hydrogen bonds with water.
   • Nylon, being a synthetic polymer, has fewer opportunities to form strong hydrogen bonds with water compared to cotton.
   • Therefore, intermolecular hydrogen bonding with water is more pronounced in cotton clothes than in nylon. Thus, Statement II is false.

Based on the analysis above, the correct answer is: Statement I is true but Statement II is false.

Option Explanation:

• Statement I is false but Statement II is true: Incorrect, as Statement I is true and Statement II is false.
• Statement I is true but Statement II is false: Correct, matches our analysis.
• Both Statement I and Statement II are true: Incorrect, as Statement II is false.
• Both Statement I and Statement II are false: Incorrect, as Statement I is true.

Summary tip: Understanding the material properties, especially regarding water absorbency and intermolecular interactions, is crucial for correctly answering questions about fabric behavior.

Answer 2

Statement I: Wet cotton clothes made of cellulose-based carbohydrate take comparatively longer time to get dried than wet nylon polymer-based clothes. Cotton is primarily cellulose, which has numerous hydroxyl (-OH) groups. 
These hydroxyl groups can form strong hydrogen bonds with water molecules, holding the water within the fabric structure. Nylon, a synthetic polyamide, also has polar amide (-CONH-) groups that can form hydrogen bonds with water, but to a lesser extent than cellulose due to differences in the polymer structure and the availability of hydrogen bonding sites. 
Because cotton retains more water due to stronger hydrogen bonding, it takes longer to dry. 
Therefore, Statement I is true. Statement II: Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes. 
As explained above, cellulose (cotton) has a higher density of hydroxyl groups compared to the amide groups in nylon, leading to more extensive hydrogen bonding with water molecules in cotton. 
Nylon has polar amide groups that can hydrogen bond with water, but the overall intermolecular hydrogen bonding with water is less than in cotton. Therefore, Statement II is false. 
In conclusion, Statement I is true, but Statement II is false. This corresponds to option (2).