6. A fatty acid gives nonanal and 9-oxononanoic acid on ozonolysis followed by zinc treatment. This fatty acid gives stearic acid on hydrogenation by H₂/Pd. What is this fatty acid?
(A) Lauric acid
(B) Palmitic acid
(C) Arachidic acid
(D) Oleic acid
(E) Arachidonic acid

2. Ninhydrin is the hydrate of a triketone and is in equilibrium with it.In the following statements which one is TRUE? (A) Ninhydrin is a good reagent for testing α-amino acids, usually carried out at acidic condition. (B) The positive ninhydrin test usually exhibits an intense purple color. (C) Ninhydrin is a good reagent for testing nucleosides, usually carried out at basic condition. (D) The positive ninhydrin test usually exhibits a red color. (E) The positive ninhydrin test usually exhibits a green color.

3. Which one is WRONG for gas chromatography? (A) The mobile phase does not interact with molecules of the sample. (B) Capillary columns provide higher resolution than packed columns. (C) Reproducible retention times require control of the column temperature. (D) Immobilized liquid phase should be chemical inert and low volatile. (E) This method is applicable to species that are appreciably non-volatile.

4. Which of the following contains the metal with the lowest oxidation number? (A) CaCl2 (B) FeSO4 (C) MnO2 (D) CrO3 (E) NaBr

5. Which detector is used in the infrared spectrum? (A) phototube (B) photomultiplier tube (C) photodiode arrays (D) silicon photodiodes (E) thermal detector

7. Cell membranes are composed mostly of _____________ organized into a lipid bilayer which serves as an effective barrier to the passage of water, ions, and other components into and out of cells. (A) glycerophospholipids (B) sphingomyelins (C) prostaglandins (D) lipids (E) fatty acid

8. Wohl degradation: a multi-step reaction sequence for degrading an aldose into the next lower homolog. What is the missing reagent in the following Wohl degradation? (A) KMnO4 (B) AgO (C) NH3 (D) NH2NH2 (E) NH2OH

9. Lactose yields 1 equivalent D-glucose and 1 equivalent _________ on hydrolysis. (A) D-fructose (B) D-galactose (C) D-mannose (D) D-ribose (E) D-deoxyribose

10. Sucrose is an example of__________. (A) a reducing sugar (B) a ketohexose (C) an anomer of ribose (D) an aldohexose (E) a disaccharide

11. Glucosamine, the monosaccharide unit from chitin has an amino group at what position? (A) C1 (B) C2 (C) C3 (D) C4 (E) C5

12. Which of the following Fischer projections of glyceraldehydes represent the same configuration with A?(A) 1, 3 (B) 1, 2 (C) 2, 3 (D) 1, 2, 3 (E) none of these