• Gas-Liquid Chromatography (GLC):
• In gas chromatography, a vaporized sample is transported by an inert mobile carrier gas ($He, N_2$) through a capillary column coated with a stationary liquid phase.
• The separation of volatile compounds is primarily governed by:

• Boiling Point (Volatility): Compounds with lower boiling points possess higher vapor pressures, spend more time in the mobile gas phase, and elute first.
• Partition coefficient / chemical affinity for the stationary phase.
  • nalysis:

• (Boiling points): Correct.

• Properties of D-Fructose:
• Fructose (Fruit sugar / Levulose) is a 6-carbon ketohexose found naturally in honey, tree fruits, berries, and vegetables.
• It is the primary sugar present in honey (along with glucose).
• Fructose is the sweetest naturally occurring carbohydrate, possessing a relative sweetness index of $\approx 170$ (compared to sucrose as baseline 100, and glucose at 74).
• nalysis:
• (Fructose): Correct.

Correct option: (3) Fructose

• Functional Classification of Proteins:
• Hemoglobin is a globular tetrameric metalloprotein containing four heme iron groups ($Fe^{2+}$) bound to globin polypeptide chains.
• Its defined physiological role is as a transport protein that reversibly binds molecular oxygen ($O_2$) at respiratory surfaces (gills/lungs) and transports it through the vascular bloodstream to aerobic peripheral tissues.
• nalysis:
• (Transport Protein): Correct.

Correct option: (4) Transport Protein