Question

The number of $\sigma$ bonds and $\pi$-bonds present in $\text{pent-4-en-1-yne}$ is:

• A. $10,3$
• B. $4,9$
• C. $3,10$
• D. $9,4$

Answer 1

The correct option is A $10,3$

$HC\equiv C-{CH}_2-CH={CH}_2$

$\text{Pent-4-en-1-yne}$

Triple bond between $C$ and $C$ contains one $\sigma$ bond and two $\pi$ bonds. Double bond between $C$ and $C$ contains one $\sigma$ bond and one $\pi$ bond.

Total $\sigma$ bonds$=10$

Total $\pi$ bonds $=3$

Hence, the correct option is $\text{A}$