Comparing hydrogen atoms via molecular formulas

Steps:

• Determine molecular formula for each: glucose is C6H12O6; glycine (R=H) is C2H5NO2; glycerol is C3H8O3; saturated C8 fatty acid is C8H16O2.
• Count hydrogens: glucose has 12; glycine has 5; glycerol has 8; fatty acid has 16.
• Compare values: 5 is the smallest.
• Select option with 5 hydrogens.

Why B is correct:

• Glycine formula C2H5NO2 contains exactly 5 hydrogen atoms, the minimum among options.

Why the others are wrong:

• A: Glucose (C6H12O6) has 12 hydrogens.
• C: Glycerol (C3H8O3) has 8 hydrogens.
• D: C8 fatty acid (C8H16O2) has 16 hydrogens.

Final answer: B