Question

Total number of sigma (\( \sigma \)) and pi (\( \pi \)) bonds respectively present in hex-1-en-4-yne are:

• A. 13 and 3
• B. 11 and 3
• C. 13 and 13
• D. 14 and 3

Hint:

When counting bonds in organic compounds, remember that each single bond is a \( \sigma \)-bond, each double bond consists of one \( \sigma \)-bond and one \( \pi \)-bond, and each triple bond consists of one \( \sigma \)-bond and two \( \pi \)-bonds.

Answer 1

The Correct Option is A

The structure of hex-1-en-4-yne consists of:
- A C=C double bond (with one \( \sigma \)-bond and one \( \pi \)-bond).
- A C≡C triple bond (with one \( \sigma \)-bond and two \( \pi \)-bonds).
- Six single bonds between carbon atoms and hydrogen atoms (each \( \sigma \)-bonds).
Count of \( \sigma \)-bonds:
- 1 \( \sigma \)-bond in the C=C double bond.
- 1 \( \sigma \)-bond in the C≡C triple bond.
- 11 \( \sigma \)-bonds between carbon and hydrogen atoms.
Thus, the total number of \( \sigma \)-bonds is 13.
Count of \( \pi \)-bonds:
- 1 \( \pi \)-bond in the C=C double bond.
- 2 \( \pi \)-bonds in the C≡C triple bond.
Thus, the total number of \( \pi \)-bonds is 3.
Therefore, the correct answer is

(1) 13 and 3.