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Chlorophyll ‘a’ molecule at its carbon atom 3 of the Pyrrole ring II has one of the following:

1. aldehyde group
2. methyl group
3. carboxyl group
4. magnesium

Correct answer: methyl group

Solution

Chlorophyll a has a methyl group at carbon 3 of pyrrole ring II. The aldehyde group is characteristic of chlorophyll b instead, so the correct choice is methyl.

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