Assertion: Cyclopentadienyl anion is aromatic in nature.
Reason: Cyclopentaddienyl anion has six `pi` electrons.

Options

A. If both assertion and reson are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To determine whether the assertion and reason provided in the question are correct, we will analyze the aromaticity of the cyclopentadienyl anion step by step.

### Step 1: Understanding Cyclopentadienyl Anion
The cyclopentadienyl anion is derived from cyclopentadiene by adding an extra electron, resulting in a negatively charged species. It has five carbon atoms arranged in a cyclic structure.

**Hint:** Identify the structure of the cyclopentadienyl anion and note its cyclic nature.

### Step 2: Planarity of the Molecule
For a compound to be aromatic, it must be planar. In the case of the cyclopentadienyl anion, all carbon atoms are sp² hybridized, which allows them to lie in the same plane.

**Hint:** Check the hybridization of the carbon atoms in the cyclopentadienyl anion.

### Step 3: Conjugation
Aromatic compounds must have a continuous overlap of p-orbitals, which allows for delocalization of π electrons. In the cyclopentadienyl anion, the π electrons from the double bonds and the lone pair on one of the carbon atoms contribute to a system of conjugation.

**Hint:** Look for the presence of double bonds and lone pairs that can participate in π bonding.

### Step 4: Huckel's Rule
According to Huckel's rule, a compound is aromatic if it contains \(4n + 2\) π electrons, where \(n\) is a non-negative integer. The cyclopentadienyl anion has a total of 6 π electrons (4 from the two double bonds and 2 from the lone pair).

**Hint:** Calculate the total number of π electrons and check if it fits Huckel's rule.

### Step 5: Conclusion
Since the cyclopentadienyl anion is cyclic, planar, has a continuous overlap of p-orbitals (conjugation), and contains 6 π electrons, it satisfies all the criteria for aromaticity. Therefore, the assertion that the cyclopentadienyl anion is aromatic is true. The reason that it has 6 π electrons is also true and correctly explains the assertion.

**Final Answer:** Both the assertion and reason are true; the cyclopentadienyl anion is aromatic because it has 6 π electrons.

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