Which of the following is a heterocyclic compound ?

Options

A. (1)
B. (2)
C. (3)
D. (4)

Explanation

To determine which of the given compounds is a heterocyclic compound, we need to follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Heterocyclic Compounds**:
- A heterocyclic compound is defined as a compound that contains a ring structure with at least one atom that is not carbon (known as a heteroatom). Common heteroatoms include nitrogen (N), oxygen (O), and sulfur (S).

2. **Analyze the Given Options**:
- We need to examine each of the four compounds provided in the options to identify if they contain a ring structure with a heteroatom.

3. **Examine Each Compound**:
- **Option A**: Check if it contains a ring and if that ring has any heteroatoms.
- **Option B**: Repeat the same analysis as in Option A.
- **Option C**: Again, check for the presence of a ring and heteroatoms.
- **Option D**: Analyze this option carefully for the presence of a ring and any heteroatoms.

4. **Identify the Heterocyclic Compound**:
- After analyzing all four options, identify which option contains a ring structure with at least one heteroatom.

5. **Conclusion**:
- Based on the analysis, if Option D contains an oxygen atom in a ring structure while the other options consist solely of carbon atoms, then Option D is the heterocyclic compound.

### Final Answer:
- The heterocyclic compound among the options is **Option D**.