Question

The number of sigma and pi-bonds in 1-butene-3-yne are:

• A. 6 sigma and 4 pi
• B. 7 sigma and 3 pi
• C. 5 sigma and 5 pi
• D. none of these

Answer 1

Answer: (B)

7 sigma and 3 pi

The number of sigma and pi-bonds in $1-butene-3-yne$ are 7 and 3 respectively.
Hence, the option (B) is correct answer.