Question

In acetylene molecule, the two carbon atoms are linked by

• A. One-$\sigma$-bond and two $\pi$-bonds
• B. two $\sigma$-bonds and one $\pi$-bond
• C. three $\sigma$-bonds
• D. three $\pi$-bonds

Answer 1

Answer: (A)

Ethyne has a triple bond between the two carbon atoms.
In the diagram, each line represents one pair of shared electrons.
$H - C \equiv C - H$
Two carbon atoms have one sigma bonds and two pi bonds.