Match List I with List II List I List II A. RNA I. Glycogen B. Invert…

The correct answer is Option (3) → A-III, B-IV, C-I, D-II

Each List-I item is a description or a common name of a carbohydrate:

• A. RNA — This matches III. Ribose. The sugar in RNA nucleotides is β-D-ribose; DNA contains β-D-2-deoxyribose.

• B. Invert sugar — This matches IV. Sucrose. Sucrose is dextrorotatory, but its hydrolysis gives equal amounts of D-(+)-glucose (+52.5°) and D-(−)-fructose (−92.4°). The mixture is laevorotatory, so the sign of rotation is inverted and the product is called invert sugar.

      \( \ce{C12H22O11 + H2O} \xrightarrow{\ce{H^+}} \ce{C6H12O6} \text{ (glucose)} + \ce{C6H12O6} \text{ (fructose)} \)

• C. Animal starch — This matches I. Glycogen. Carbohydrates are stored in the animal body (liver, muscles, brain) as glycogen, a branched polymer of α-D-glucose.

• D. Milk sugar — This matches II. Lactose. Lactose is the disaccharide of milk, made of β-D-galactose and β-D-glucose.

Shortcut: A-III and B-IV appear in Options (3) and (4); C-I (animal starch = glycogen) leaves only Option (3).

NCERT (2026-27 edition):
Disaccharides – “… Sucrose is dextrorotatory but after hydrolysis gives dextrorotatory glucose and laevorotatory fructose. Since the laevorotation of fructose (–92.4°) is more than dextrorotation of glucose (+ 52.5°), the mixture is laevorotatory. Thus, hydrolysis of sucrose brings about a change in the sign of rotation, from dextro (+) to laevo (–) and the product is named as invert sugar.”

Disaccharides – “… (iii) Lactose: It is more commonly known as milk sugar since this disaccharide is found in milk.”

Polysaccharides – “… (iii) Glycogen: The carbohydrates are stored in animal body as glycogen. It is also known as animal starch because its structure is similar to amylopectin and is rather more highly branched.”

Chemical Composition of Nucleic Acids – “… In DNA molecules, the sugar moiety is β-D-2-deoxyribose whereas in RNA molecule, it is β-D-ribose.”