What change occurs during conversion of proto chlorophyll to chlorophyll :

Options

A. Addition of 2H in one pyrrole ring
B. Loss of 2H
C. Addition of Mg
D. Loss of Mg

Answer

To understand the conversion of protochlorophyll to chlorophyll, we can break down the process into several key steps:

### Step-by-Step Solution:

1. **Definition of Protochlorophyll**: Protochlorophyll is a precursor to chlorophyll that is found in etiolated (light-deprived) plants. It is important to understand that this compound is not fully functional for photosynthesis until it is converted to chlorophyll.

**Hint**: Remember, protochlorophyll is present in plants that have not been exposed to light.

2. **Role of Light**: The conversion of protochlorophyll to chlorophyll occurs when the plant is exposed to light. Light is essential for this transformation.

**Hint**: Think about how light influences chemical reactions in plants.

3. **Reduction Process**: The process of conversion involves a reduction reaction, which is characterized by the addition of hydrogen. In this case, the addition of 2 hydrogen atoms (2H) is crucial for the transformation.

**Hint**: Recall that reduction often involves the gain of electrons or hydrogen in chemical reactions.

4. **Chemical Changes**: During the conversion, specific changes occur in the structure of the protochlorophyll molecule. This includes the addition of 2 hydrogen atoms to one of the pyrrole rings in the protochlorophyll structure.

**Hint**: Focus on the structural components of chlorophyll, particularly the pyrrole rings.

5. **Final Outcome**: After the addition of 2 hydrogen atoms, protochlorophyll is successfully converted into chlorophyll, which is essential for the process of photosynthesis.

**Hint**: Consider the significance of chlorophyll in capturing light energy for photosynthesis.

### Conclusion:
The correct answer to the question regarding the change that occurs during the conversion of protochlorophyll to chlorophyll is the **addition of 2H in one pyrrole ring**.