Question

Which of the below statements is/are not correct regarding chlorophyll a molecule?

(i) Molecule formula of chl a is $C_{55}{H}_{72}{O}_5{N}_{4}Mg$
(ii) It is the primary photosynthetic pigment.
(iii) In the pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength.
(iv)It is a soluble in water as well as petroleum ether.

• A. (i) and (iii)
• B. (iii) and (iv)
• C. (ii) only
• D. (iv) only

Answer 1

The correct option is B (iii) and (iv)

Chlorophyll a is the primary photosynthetic pigment, which is bluish green in the pure state. It has an empirical formula $C_{55}{H}_{72}{O}_5{N}_{4}Mg$and molecular weight of $893$. It absorbs more red wavelength of light than violet blue . It is soluble in a number of organic solvents such as petroleum ether.

So, the correct answer is ' In the pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength and It is a soluble in water as well as petroleum ether'.