Question

The number of $\sigma$ and $\pi$-bonds in $But-1-en-$$3$-yne is:

• A. $5$ $\sigma$ and $5$ $\pi$
• B. $7$ $\sigma$ and $3$ $\pi$
• C. $8$ $\sigma$ and $2$ $\pi$
• D. $6$ $\sigma$ and $3$ $\pi$

Answer 1

The correct option is B $7$ $\sigma$ and $3$ $\pi$

From the structure, it can be seen that it contains $7$ sigma and $3$ pi bonds.