The number of `sigma` and `pi` bonds in a molecule of acetylene respectively, are

Options

A. `3sigma` and `2pi`
B. `2sigma` and `3pi`
C. `5sigma` and `2pi`
D. `5sigma` and `3pi`

Explanation

To determine the number of sigma (σ) and pi (π) bonds in a molecule of acetylene (C₂H₂), we can follow these steps:

### Step 1: Understand the Structure of Acetylene
Acetylene has the molecular formula C₂H₂. It consists of two carbon atoms and two hydrogen atoms. The structure can be represented as:

```
H - C ≡ C - H
```

### Step 2: Identify the Types of Bonds
In acetylene, the carbon atoms are connected by a triple bond. A triple bond consists of:
- 1 sigma (σ) bond
- 2 pi (π) bonds

Additionally, each carbon atom is bonded to one hydrogen atom through a single bond, which consists of:
- 1 sigma (σ) bond

### Step 3: Count the Sigma and Pi Bonds
Now, we can count the total number of sigma and pi bonds in acetylene:
- From the triple bond between the two carbon atoms:
- 1 σ bond
- 2 π bonds
- From the two C-H single bonds (one for each hydrogen):
- 2 σ bonds (1 for each C-H bond)

### Step 4: Total Count
Now, we can sum up the bonds:
- Total σ bonds = 1 (from C≡C) + 2 (from C-H) = 3 σ bonds
- Total π bonds = 2 (from C≡C) = 2 π bonds

### Conclusion
Thus, the number of sigma and pi bonds in a molecule of acetylene is:
- **3 sigma bonds and 2 pi bonds.**

### Final Answer
The answer is: **3 sigma and 2 pi bonds.**

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