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(D) The molecular formulas for chlorophyll-$a$ and chlorophyll-$b$ are as follows:Chlorophyll-$a$: $C_{55}H_{72}O_{5}N_{4}Mg$Chlorophyll-$b$: $C_{55}H

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$C_{55}H_{70}O_{6}N_{4}Mg$

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(D) The molecular formulas for chlorophyll-$a$ and chlorophyll-$b$ are as follows:Chlorophyll-$a$: $C_{55}H_{72}O_{5}N_{4}Mg$Chlorophyll-$b$: $C_{55}H_{70}O_{6}N_{4}Mg$Chlorophyll-$b$ differs from chlorophyll-$a$ by having a formyl group $(-CHO)$ instead of a methyl group $(-CH_{3})$ at the third carbon position of the porphyrin ring. This substitution results in the loss of two hydrogen atoms and the gain of one oxygen atom compared to chlorophyll-$a$.

Which of the following represents the correct molecular formula of chlorophyll-$b$?

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