The molecular formula of chlorophyll b is:
Correct answer: B. C₅₅H₇₀O₆N₄Mg
- A. C₅₅H₇₂O₅N₄Mg
- B. C₅₅H₇₀O₆N₄Mg
- C. C₅₅H₇₄O₅N₄Mg
- D. C₅₅H₇₀O₄N₄Mg
Explanation
Among the given options, option B (C₅₅H₇₀O₆N₄Mg) correctly represents the molecular formula of chlorophyll b, the pigment responsible for capturing light energy and complementing chlorophyll a in photosynthesis. Chlorophyll b differs from chlorophyll a by having a formyl (-CHO) group instead of a methyl (-CH₃) group, resulting in two fewer hydrogen atoms and one more oxygen atom. The other options are incorrect: Option A describes chlorophyll a, option C has an unrealistically high hydrogen count, and option D lacks the proper number of oxygen atoms required for the formyl substitution in chlorophyll b.
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