Statement I: Wet cotton clothes made of cellulose-based carbohydrate take comparatively longer time скачать в хорошем качестве

Statement I: Wet cotton clothes made of cellulose-based carbohydrate take comparatively longer time

Given below are two statements: Statement I: Wet cotton clothes made of cellulose-based carbohydrate take 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: (1) Statement I is false but Statement II is true (2) Statement I is true but Statement II is false (3) Both Statement I and Statement II are true (4) Both Statement I and Statement II are false Concepts and Theory: Drying of wet clothes involves the evaporation of water molecules adhered to the fabric. Cotton is a natural polymer made of cellulose, which is a carbohydrate-based polymer rich in hydroxyl (–OH) groups. These hydroxyl groups form strong hydrogen bonds with water molecules, making cotton highly hydrophilic and leading to water being retained longer. In contrast, nylon is a synthetic polymer with relatively fewer –OH groups and more hydrophobic character, allowing water to evaporate faster. Hydrogen bonding is stronger in cellulose-based fibers like cotton because of the dense presence of polar –OH groups. These groups interact extensively with water molecules through hydrogen bonding, increasing water retention and hence slowing down drying. Nylon, while also capable of hydrogen bonding (especially due to –NH and C=O groups in its structure), has a more compact and crystalline structure with less surface area for water binding. Hence, hydrogen bonding in nylon with water is actually less than in cotton. It’s important to differentiate between water absorption and hydrogen bonding. Cotton absorbs more water due to its structure and polarity, while nylon is more water-repellent. The misconception that nylon has more hydrogen bonding with water arises from confusion with its internal hydrogen bonding (within the polymer chains), not with external water molecules. Thus, when comparing drying behavior and interaction with water, cotton shows stronger intermolecular bonding with water, not nylon.