In Ortho and Para hydrogen, the nuclear spin respectively are

Options

A. Parallel and opposite
B. Opposite and parallel
C. It may be parallel or opposite
D. They do not differ in nuclear spin

Answer

To solve the question regarding the nuclear spin of ortho and para hydrogen, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding Ortho and Para Hydrogen**:
- Ortho hydrogen refers to the molecular form of hydrogen (H₂) where the spins of the two hydrogen nuclei (protons) are aligned in the same direction.
- Para hydrogen refers to the molecular form of hydrogen (H₂) where the spins of the two hydrogen nuclei are aligned in opposite directions.

2. **Identifying Nuclear Spin Orientation**:
- In ortho hydrogen, the nuclear spins are parallel. This means both protons are spinning in the same direction.
- In para hydrogen, the nuclear spins are opposite. This means one proton spins in one direction while the other spins in the opposite direction.

3. **Conclusion**:
- Therefore, the nuclear spins of ortho and para hydrogen are respectively parallel and opposite.

### Final Answer:
The nuclear spins in ortho and para hydrogen are respectively **parallel and opposite**.