A) Chlorophyll-a has an methyl group and chlorophyll-b has aldehyde group in position X
B) Chlorophyll-a has an aldehyde group and chlorophyll-b has a methyl group in position X
C) Chlorophyll-a has a carboxyl group and chlorophyll-b has an aldehyde group in position X
D) Chlorophyll-a has an ethyl group and chlorophyll-b has an aldehyde group in position X
Correct Answer: A
Solution :
Chlorophylls are magnesium porphyrin compounds. Chlorophyll-a (\[{{C}_{55}}{{H}_{72}}{{O}_{5}}{{N}_{4}}Mg\]) and chlorophyll-5 (\[{{C}_{55}}{{H}_{70}}{{O}_{6}}{{N}_{4}}Mg\]), both consists of Mg porphyrin head, which is hydrophilic and a phytol tail, which is lipophilic but chlorophyll-!) differs from chlorophyll-a only in one of the functional groups bonded to porphyrin. Actually in chlorophyll-5 there is a - CHO (aldehyde) group instead of \[a-C{{H}_{3}}\](methyl) group at the 3rd C-atom in II pyrrol ring.
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