Multiple choice

The molecular formula of Chlorophyll ‘a’ is

  1. C55H72O5N4Mg

  2. C55H70O6N4Mg

  3. C55H72O6N4Mg

  4. C50H72O5N4Mg
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A Correct answer
Explanation

Chlorophyll 'a' has the molecular formula C55H72O5N4Mg, containing a porphyrin ring with a magnesium atom at the center. Chlorophyll 'b' differs by having one more oxygen atom (C55H70O6N4Mg). The key difference is the substitution of a formyl group (-CHO) for the methyl group (-CH3) on the porphyrin ring.

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