Discussion
Choose the right matches:
| (1) Carotenoid | \(\text{C}_{55}\text{H}_{70}\text{O}_{5}\text{N}_{4}\text{Mg}\) |
| (2) Chlorophyll 'a' | \(\text{C}_{55}\text{H}_{72}\text{O}_{5}\text{N}_{4}\text{Mg}\) |
| (3) Chlorophyll 'b' | \(\text{C}_{55}\text{H}_{70}\text{O}_{6}\text{N}_{4}\text{Mg}\) |
| (4) Xanthophyll | \(\text{C}_{50}\text{H}_{70}\text{O}_{5}\text{Mg}\) |
Answer: C
Statements (2) and (3) are correct. Chlorophyll a is C55H72O5N4Mg and chlorophyll b, which has a formyl group in place of a methyl group, is C55H70O6N4Mg, exactly as the question prints them.
(1) is wrong because a carotenoid is a C40 hydrocarbon pigment with no magnesium, and (4) is wrong because xanthophylls are oxygenated carotenoids, also magnesium-free. Any option containing (1) or (4) is therefore rejected.
Magnesium sits at the centre of the porphyrin ring of both chlorophylls, which is why Mg appears in each formula, while the carotenoids and xanthophylls are accessory pigments that contain only carbon, hydrogen and (for xanthophylls) oxygen.
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