Which of the following is oxetane?

Options

A.
B.
C.
D.

Explanation

To determine which of the given compounds is oxetane, we will follow these steps:

### Step 1: Understand the Structure of Oxetane
Oxetane is a four-membered cyclic ether. It consists of one oxygen atom and three carbon atoms in a ring structure.

### Step 2: Identify the Other Compounds
We need to differentiate oxetane from other cyclic ethers:
- **Oxirane**: This is a three-membered cyclic ether (also known as an epoxide) with one oxygen and two carbons.
- **Tetrahydrofuran (THF)**: This is a five-membered cyclic ether with one oxygen and four carbons.
- **Tetrahydropyran**: This is a six-membered cyclic ether with one oxygen and five carbons.

### Step 3: Analyze the Options
Given the options, we need to identify which one corresponds to the structure of oxetane:
- **Option A**: Likely oxirane (3-membered).
- **Option B**: This is the candidate for oxetane (4-membered).
- **Option C**: Likely tetrahydrofuran (5-membered).
- **Option D**: Likely tetrahydropyran (6-membered).

### Step 4: Confirm the Correct Option
From our analysis, option B is the only one that corresponds to the structure of oxetane, which is a four-membered cyclic ether.

### Final Answer
The correct answer is **Option B**, which is oxetane.

---