Match List I with List II.

A-i; B-ii; C-iii; D-iv

The correct answer is option 1. A-i; B-ii; C-iii; D-iv.

Let us break down each component:

A. Cellulose: (i) Natural Polymer: Cellulose is a natural polymer found in the cell walls of plants. It is composed of long chains of glucose molecules linked together by glycosidic linkages. These linkages involve the condensation of hydroxyl \((-OH)\) groups on adjacent glucose units, forming a strong and stable structure. Cellulose is one of the most abundant organic compounds on Earth and serves as a structural component in plants, providing rigidity and support.

B. Nylon 6,6: (ii) Synthetic polymer: Nylon 6,6 is a synthetic polymer formed through the condensation polymerization of adipic acid and hexamethylenediamine. This process results in the formation of amide linkages (also known as peptide bonds) between the carboxyl group of adipic acid and the amino group of hexamethylenediamine. Nylon 6,6 is a versatile material known for its strength, durability, and resistance to abrasion, making it suitable for a wide range of applications, including textiles, engineering plastics, and automotive parts.

C. Protein: (iii) Amide linkage: Proteins are natural polymers made up of long chains of amino acids linked together by peptide bonds. Peptide bonds are formed through the condensation reaction between the amino group of one amino acid and the carboxyl group of another amino acid, resulting in the elimination of a water molecule. Proteins are essential biomolecules that perform a wide variety of functions in living organisms, including structural support, enzymatic catalysis, transport, and signaling.

D. Sucrose: (iv) Glycosidic linkage: Sucrose is a disaccharide composed of glucose and fructose units linked together by glycosidic linkages. Glycosidic linkages are formed through the condensation of the hydroxyl (-OH) group of one sugar molecule with the anomeric carbon atom of another sugar molecule, resulting in the elimination of a water molecule. Sucrose is a common carbohydrate found in many plants and serves as a source of energy for organisms.

So, the matching A-i; B-ii; C-iii; D-iv correctly identifies each polymer and its corresponding linkage or classification.