Which statement accurately describes sigma and pi bonds?

Which statement accurately describes sigma and pi bonds?

• A. Sigma bonds are stronger
• B. Pi bonds are stronger
• C. They have equal strength
• D. Pi bonds are weaker than sigma bonds

Answer: (A)

Bond strength is determined by how effectively the orbitals overlap along the bond axis. A sigma bond forms by end-to-end overlap directly between the nuclei, creating a high electron density right between the atoms and a strong attraction, so it contributes the most to bond energy. A pi bond comes from sideways overlap of p orbitals above and below the bond axis, where the overlap is less effective and the electron density is off the axis. This weaker overlap means a lower bond dissociation energy for a pi bond. In a double bond, there is one sigma and one pi bond, but the overall strength is dominated by the sigma component. Therefore, sigma bonds are stronger.

Bond strength is determined by how effectively the orbitals overlap along the bond axis. A sigma bond forms by end-to-end overlap directly between the nuclei, creating a high electron density right between the atoms and a strong attraction, so it contributes the most to bond energy. A pi bond comes from sideways overlap of p orbitals above and below the bond axis, where the overlap is less effective and the electron density is off the axis. This weaker overlap means a lower bond dissociation energy for a pi bond. In a double bond, there is one sigma and one pi bond, but the overall strength is dominated by the sigma component. Therefore, sigma bonds are stronger.