JEE Chemistry 2025 Question with Solution

Given: Two statements compare drying behavior of cotton and nylon clothes in terms of hydrogen bonding with water.

Find: Which option correctly states the truth values of Statement I and Statement II.

Cotton is made of cellulose, which contains many hydroxyl groups $\text{-OH}$. These groups form extensive hydrogen bonding with water molecules, so cotton absorbs and retains more water.

Nylon is a synthetic polyamide containing amide groups, which can also interact with water, but its hydrogen bonding with water is less extensive than that of cellulose-based cotton.

So, Statement I is true because wet cotton clothes retain more water and therefore take longer to dry than nylon-based clothes.

Statement II is false because intermolecular hydrogen bonding with water is greater in cotton than in nylon, not more in nylon-based clothes.

Therefore, the correct option is B: Statement I is true but Statement II is false.

Given:

1. Statement I: Wet cotton clothes made of cellulose-based carbohydrate take comparatively longer time to get dried than wet nylon polymer-based clothes.
2. Statement II: Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes.

Find: Determine the correct option.

For Statement I, cotton is a natural fibre composed of cellulose. Cellulose has many hydroxyl groups $\text{-OH}$ that form hydrogen bonds with water molecules. Because of this high water absorbency, cotton holds more water and takes longer to dry.

Nylon contains amide groups such as $\text{-CONH-}$, so it can interact with water, but its overall water absorption is less than cotton. Hence nylon dries faster compared to cotton under similar conditions.

Therefore, Statement I is true.

For Statement II, the claim says hydrogen bonding with water is more in nylon than in cotton. This is incorrect because cotton has a higher density of available hydroxyl groups and shows more extensive hydrogen bonding with water molecules than nylon.

Therefore, Statement II is false.

Hence, the correct conclusion is: Statement I is true but Statement II is false, so the correct option is B.