Question

if sigma bond is stronger than pi then why double bond is stronger then sigma bond

Answer 1

because the distense of double bond is less then single bond

Answer 2

Answer :

Sigma bond (σ bond) is formed by the axial overlapping of the atomic orbitals while the π-bond is formed by side wise overlapping. Since axial overlapping is greater as compared to side wise. Thus, the sigma bond is said to be stronger bond in comparison to a π-bond.

$\rule{200}{2}$