Nuclear isomerism is exhibited by-

Options

A. Molecules H only
B. All diatomic molecule
C. All diatomic molecule having even Z value
D. All diatomic molecule having odd Z value.

Explanation

To solve the question regarding nuclear isomerism, we will follow these steps:

### Step 1: Understand Nuclear Isomerism
Nuclear isomerism refers to the existence of different nuclear states (isomers) of the same element that have the same number of protons and neutrons but differ in energy levels. These isomers can have different nuclear spins and energy states.

**Hint:** Remember that nuclear isomers are related to the arrangement of nucleons (protons and neutrons) within the nucleus.

### Step 2: Identify the Conditions for Nuclear Isomerism
Nuclear isomerism is typically exhibited by nuclei that have an odd atomic number (Z). This is because odd-Z nuclei can have unpaired nucleons, leading to different energy states.

**Hint:** Focus on the atomic number (Z) of the elements in the options provided. Odd Z values are key.

### Step 3: Analyze the Given Options
We need to evaluate the options (A, B, C, D) provided in the question to determine which of them have an odd atomic number.

**Hint:** List the atomic numbers of the elements in the options to identify which ones are odd.

### Step 4: Determine the Correct Option
Based on the analysis of the options:
- If any of the options have an odd atomic number, they will exhibit nuclear isomerism.
- If all options are evaluated, the correct option will be the one that meets the criteria of having an odd Z value.

**Hint:** After evaluating the options, select the one that meets the criteria for exhibiting nuclear isomerism.

### Step 5: Conclusion
From the analysis, we conclude that the correct answer is the option that represents a diatomic molecule with an odd atomic number.

**Final Answer:** Option D is correct.