Which of the following does contain three pairs of electrons ?

Options

A. Carbocation
B. Carbanion
C. Free radical
D. None of these.

Explanation

To determine which of the given options contains three pairs of electrons, we need to analyze each option step by step.

### Step 1: Understanding the Concept of Electron Pairs
- An electron pair consists of two electrons. Therefore, three pairs of electrons would mean a total of 6 electrons.

### Step 2: Analyzing Each Option

#### Option 1: Carbocation
- A carbocation is a positively charged carbon atom that has only three bonds (to hydrogen or other atoms).
- Structure: CH₃⁺ (for example)
- In this structure, the carbon has:
- 3 single bonds with hydrogen atoms (each bond represents 2 electrons).
- Total electrons = 3 bonds × 2 electrons/bond = 6 electrons.
- Therefore, a carbocation has 3 pairs of electrons.

#### Option 2: Carbanion
- A carbanion is a negatively charged carbon atom that has an extra electron.
- Structure: CH₃⁻ (for example)
- In this structure, the carbon has:
- 3 single bonds with hydrogen atoms (each bond represents 2 electrons).
- 1 extra electron due to the negative charge.
- Total electrons = 3 bonds × 2 electrons/bond + 1 extra electron = 6 + 1 = 7 electrons.
- Therefore, a carbanion does not have 3 pairs of electrons; it has 3.5 pairs.

#### Option 3: Free Radical
- A free radical has an unpaired electron.
- Structure: CH₃• (for example)
- In this structure, the carbon has:
- 3 single bonds with hydrogen atoms (each bond represents 2 electrons).
- 1 unpaired electron.
- Total electrons = 3 bonds × 2 electrons/bond + 1 unpaired electron = 6 + 1 = 7 electrons.
- Therefore, a free radical does not have 3 pairs of electrons; it has 3.5 pairs.

#### Option 4: None of Them
- This option suggests that none of the above options contain three pairs of electrons.

### Conclusion
- The only option that contains three pairs of electrons (6 electrons) is the **carbocation**.

### Final Answer
**The correct answer is: Carbocation.**

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