Question

explain why a s bond formed by overlap of an s orbital with an sp3 orbital of carbon is stronger than a sbond formed by overlap of an s orbital with a p orbital of carbon

Answer 1

$sp^{3}$ orbital have less electron density than p orbital. Therefore on overlap of s orbital with $sp^{3}$ less repulsion take place than overlapping of sp3 orbital.

Electronegativity depends on s character.

In $sp^{3}$  there is hybridization between one s and 3 p orbital. Therefore,   $sp^{3}$have 25% of s character .

In p orbital , there is no s orbital present. Therefore s character is p orbital is $0$% .

Higher the electronegativity means higher tendency to attract electron.

Thus, bond form by overlap of $sp^{3}$ and $s$ will be stronger than bond formed by overlap of $s$ with $p$.

Know more about overlapping of orbitals :

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