Propyne molecule contains

Options

A. 6 sigma and 2 pi bonds
B. 5 sigma bonds
C. 5 pi bonds and 1 sigma bond
D. 2 sigma and 3 pi bonds .

Explanation

To determine the number of sigma (σ) and pi (π) bonds in the propyne molecule (C3H4), we can follow these steps:

### Step 1: Draw the Structure of Propyne
Propyne is an alkyne with three carbon atoms and a triple bond between the first and second carbon atoms. The structure can be represented as follows:

```
H H
\ /
C ≡ C - C - H
/ \
H H
```

### Step 2: Identify the Types of Bonds
In the structure of propyne:
- The triple bond between the first and second carbon consists of:
- 1 sigma bond
- 2 pi bonds
- The single bonds between the carbon atoms and hydrogen atoms are all sigma bonds.

### Step 3: Count the Sigma Bonds
1. **Triple Bond (C≡C)**:
- 1 sigma bond
2. **Single Bonds**:
- Each carbon atom is bonded to hydrogen atoms through single bonds.
- There are 5 single bonds (3 C-H bonds and 2 C-C bonds).

So, the total number of sigma bonds is:
- 1 (from the triple bond) + 5 (from the single bonds) = 6 sigma bonds.

### Step 4: Count the Pi Bonds
From the triple bond (C≡C), we have:
- 2 pi bonds.

### Conclusion
Thus, in the propyne molecule, there are a total of:
- **6 Sigma bonds**
- **2 Pi bonds**

### Final Answer
The propyne molecule contains **6 Sigma bonds and 2 Pi bonds**.

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