Which of the following is not a product of light reaction of photosynthesis ?

Options

A. ATP
B. NADH
C. NADPH
D. Oxygen

Answer

To determine which of the following is not a product of the light reaction of photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Light Reaction**: The light reaction of photosynthesis occurs in the thylakoid membranes of chloroplasts and requires sunlight. It primarily converts light energy into chemical energy.

2. **Identify the Products of Light Reaction**: The main products of the light reaction are:
- ATP (Adenosine Triphosphate)
- NADPH (Nicotinamide Adenine Dinucleotide Phosphate)
- Oxygen (O2)

3. **Analyze the Given Options**: We need to evaluate the options provided in the question to identify which one is not a product of the light reaction.
- If ATP is listed, it is a product of the light reaction.
- If NADPH is listed, it is also a product of the light reaction.
- If Oxygen is listed, it is a product of the light reaction as well.
- If NADH is listed, it is important to note that NADH is not produced in the light reaction; instead, NADPH is produced.

4. **Conclusion**: Since NADH is not a product of the light reaction, we conclude that it is the correct answer to the question.

### Final Answer:
**NADH is not a product of the light reaction of photosynthesis.**

---