A) chlorophyll-a has an ethyl group and chlorophyll-b has an aldehyde group in position x.
B) chlorophyll-a has a carboxyl gourp and chlorophyll-b has an aldehyde group in position x
C) chlorophyll-a has an aldehyde group and chlorophyli-o has a methyl group in position x
D) chlorophyll-a has a methyl group and chlorophyll-D has aldehyde group in position x
Correct Answer: D
Solution :
Chlorophyll are magnesium porphyrin compounds. Chlorophyll-a \[({{C}_{55}}{{H}_{72}}{{O}_{6}}{{N}_{4}}Mg)\] and chlorophyll-b\[({{C}_{55}}{{H}_{70}}{{O}_{6}}{{N}_{4}}Mg)\] both consist of magnesium porphyrin head which is hydrophillic and a phytal tail, which is lipophilic. But chl-b differ from chlorophyll- a only in of the functional groups bonded to porphyrin. Actually in chlorophyll-b there is \[CHO\] (aldehyde) group instead of \[-C{{H}_{3}}\] (methyl) group at third C-atom in second pyrrole ring.
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