Question

How many sigma and pi bonds are there in the given molecule?
$H-C\equiv C-C{H}_2-CH=C{H}_2$

• A. There are $3$ pi bonds and $10$ sigma bonds
• B. There are $12$ sigma bonds and $4$ pi bonds
• C. There are $12$ sigma bonds and $2$ pi bonds
• D. There are $2$ pi bonds and $4$ sigma bonds
• E. There are $8$ sigma bonds and $2$ pi bonds

Answer 1

The correct option is A There are $3$ pi bonds and $10$ sigma bonds

A single bond such as $(C-H)$ has one sigma bond whereas, a double $(C=C)$ and triple $(C\equiv C)$ bond has one sigma bond with remaining being pi bonds.

The given molecule has $10\sigma$ and $3\pi$ bonds.

Hence, option $A$ is correct.