Main difference between chlorophyll a and chlorophyll b is

- C H_{3}

of chlorophyll a is replaced by

- C H O

in chlorophyll b.

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Chlorophyll a is linear while chlorophyll b is branched.

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Chlorophyll a has no Mg.

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All of the above.

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Solution

The correct option is A $- C H_{3}$ of chlorophyll a is replaced by $- C H O$ in chlorophyll b.
The difference between the chlorophyll a and chlorophyll b is the presence of aldehyde group in place of the methyl group in chlorophyll b which changes the absorption wavelength of both the pigments.
So, the correct option is 'CH $_{3}$ of chlorophyll a is replaced by −CHO in chlorophyll b.

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