Question

The sum of sigma (σ) and pi (π) bonds in Hex-1,3-dien-5-yne is:

Answer 1

Correct Answer: 15

To solve this problem, we need to determine the number of sigma ($\sigma$) and pi ($\pi$) bonds in the given structure of Hex-1,3-dien-5-yne, which is $CH_2=CH-CH=CH-CH_2-C \equiv CH$.

1. Analyzing the Structure:
We need to count each $\sigma$ and $\pi$ bond in the molecule.

2. Counting Sigma Bonds:

• C1=C2: 1 $\sigma$ bond
• C2-C3: 1 $\sigma$ bond
• C3=C4: 1 $\sigma$ bond
• C4-C5: 1 $\sigma$ bond
• C5≡C6: 1 $\sigma$ bond
• C1-H (2): 2 $\sigma$ bonds
• C2-H (1): 1 $\sigma$ bond
• C3-H (1): 1 $\sigma$ bond
• C4-H (2): 2 $\sigma$ bonds
• C6-H (1): 1 $\sigma$ bond

Total $\sigma$ bonds = 1 + 1 + 1 + 1 + 2 + 1 + 1 + 2 + 1 = 11

3. Counting Pi Bonds:

• C1=C2: 1 $\pi$ bond
• C3=C4: 1 $\pi$ bond
• C5≡C6: 2 $\pi$ bonds

Total $\pi$ bonds = 1 + 1 + 2 = 4

4. Calculating the Sum:
Sum of $\sigma$ and $\pi$ bonds = 11 + 4 = 15

Final Answer:
The sum of sigma ($\sigma$) and pi ($\pi$) bonds is 15.