Which is the structure of pyrrole?

Options

A.
B.
C.
D.

Answer

To determine the structure of pyrrole, we can follow these steps:

### Step-by-Step Solution

1. **Identify the Definition of Pyrrole**:
Pyrrole is a heterocyclic aromatic organic compound. This means it is a cyclic compound that contains at least one atom in the ring that is not carbon (in this case, nitrogen).

**Hint**: Remember that "heterocyclic" refers to rings containing atoms other than carbon.

2. **Understand the Structure**:
Pyrrole consists of a five-membered ring. The general formula for pyrrole is C4H4NH, indicating that it has four carbon atoms, four hydrogen atoms, and one nitrogen atom.

**Hint**: The formula can help you visualize how many carbons and hydrogens are in the structure.

3. **Draw the Basic Structure**:
Start by sketching a five-membered ring. Place four carbon atoms in the ring and one nitrogen atom. The nitrogen atom will replace one of the carbon atoms.

**Hint**: Visualize the ring as a pentagon with one vertex being nitrogen.

4. **Add Hydrogen Atoms**:
Each carbon in the ring will typically have two hydrogen atoms attached to it, while the nitrogen will have one hydrogen atom. This gives the structure its aromatic character.

**Hint**: Remember that in aromatic compounds, the hydrogen atoms are often bonded to the carbon atoms in a way that maintains the stability of the ring.

5. **Select the Correct Option**:
From the given options, identify the one that matches the structure you have drawn. The correct structure of pyrrole will show a five-membered ring with four carbon atoms and one nitrogen atom, along with the appropriate hydrogen atoms.

**Hint**: Look for the option that shows a five-membered ring with an NH group and four carbon atoms.

### Final Answer
The structure of pyrrole is represented by option number A, which is a five-membered ring containing four carbon atoms and one nitrogen atom (NH).