KCET 2025 Chemistry Paper

The correct matching is:
- a. Acetic anhydride ⟶ iii. Glucose has five hydroxyl groups
(all five -OH's get acetylated to give the penta-acetate)
-b. Bromine water ⟶ i. Glucose has an aldehyde group
(Br2∕H2O. oxidises the -CHO to -COOH , leaving other -OH 's untouched)
- c. Hydroiodic acid ⟶ ii. Glucose has a straight chain of six carbon atoms
(HI reduces and cleaves C-C bonds to give n-hexane)
- d. Hydrogen cyanide ⟶ iv. Glucose has a carbonyl group
(HCN adds to the C=O to form a cyanohydrin)