Study the following statements regarding chl a molecule.
(i) Molecular formula of chl a is `C_(55)H_(72)O_(5)N_(4)Mg`.
(ii) It is the primary photosynthetic pigment.
(iii) In pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength.
(iv) It is soluble in water as well as pertroleum ether. Which of the above statements is/are not correct

Options

A. a) i and iii
B. b) iii and iv
C. c) ii only
D. d) iv only

Explanation

To determine which statements regarding the chlorophyll-a molecule are not correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Evaluate Statement (i)**:
- The molecular formula of chlorophyll-a is given as `C_(55)H_(72)O_(5)N_(4)Mg`.
- This statement is correct as the molecular formula of chlorophyll-a is indeed `C_(55)H_(72)O_(5)N_(4)Mg`.

2. **Evaluate Statement (ii)**:
- It states that chlorophyll-a is the primary photosynthetic pigment.
- This statement is also correct. Chlorophyll-a is recognized as the primary pigment involved in photosynthesis.

3. **Evaluate Statement (iii)**:
- This statement claims that in its pure state, chlorophyll-a is red in color and absorbs more blue wavelengths of light than red wavelengths.
- This statement is incorrect. In its pure state, chlorophyll-a appears bluish-green and absorbs more red light than blue light.

4. **Evaluate Statement (iv)**:
- This statement mentions that chlorophyll-a is soluble in water as well as petroleum ether.
- This statement is incorrect. Chlorophyll-a is not soluble in water; it is soluble in organic solvents like petroleum ether.

### Conclusion:
- The statements that are **not correct** are (iii) and (iv).

### Final Answer:
The statements that are not correct are **(iii) and (iv)**.

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