Question

The formula for chlorophyll a is

• A. $ {{C}_{55}}{{H}_{70}}{{O}_{6}}{{N}_{4}}Mg $
• B. $ {{C}_{55}}{{H}_{72}}{{O}_{5}}{{N}_{4}}Mg $
• C. $ {{C}_{25}}{{H}_{72}}{{O}_{5}}{{N}_{4}}Mg $
• D. $ {{C}_{22}}{{H}_{72}}{{O}_{5}}{{N}_{4}}Mg $

Answer 1

Answer: (B)

: The molecular formula of chlorophyll a is $ {{C}_{55}}\text{ }{{H}_{72}}\text{ }{{O}_{5}}{{N}_{4}}\text{ }Mg $ and that of chlorophyll b is $ {{C}_{55}}\text{ }{{H}_{70}}\text{ }{{\text{O}}_{6}}\text{ }{{N}_{4}}\text{ }Mg $ . In chlorophyll b there is a $ -CHO $ group instead of a $ -C{{H}_{3}} $ group at the 3rd C atom in II pyrrol ring.