Question

How many σ-bonds and π bonds are present in the given compound?

${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CH}=\mathrm{CH}-\mathrm{C}\equiv \mathrm{CH}$

Answer 1

Sigma bond

• “ This type of covalent bond is formed by the end to end (head-on) overlap of bonding orbitals along the internuclear axis. ”
• This is called as head on overlap or axial overlap.

pi bond

• “In the formation of π bond the atomic orbitals overlap in such a way that their axes remain parallel to each other and perpendicular to the internuclear axis.”

σ-bonds and π bonds are present in the given compound

• 1 single bond = 1 sigma bond
• 1 double bond = 1 sigma bond + 1 pi bond
• 1 triple bond = 1 sigma bond + 2 pi bonds

• So, the sigma bond in the given compound is $13$, and the pi bond is $3$.