 orbital have less electron density than p orbital. Therefore on overlap of s orbital with
 orbital have less electron density than p orbital. Therefore on overlap of s orbital with  less repulsion take place than overlapping of sp3 orbital.
 less repulsion take place than overlapping of sp3 orbital.
Electronegativity depends on s character.
In  there is hybridization between one s and 3 p orbital. Therefore,
  there is hybridization between one s and 3 p orbital. Therefore,    have 25% of s character .
have 25% of s character .
In p orbital , there is no s orbital present. Therefore s character is p orbital is  % .
% .
Higher the electronegativity means higher tendency to attract electron.
Thus, bond form by overlap of  and
 and  will be stronger than bond formed by overlap of
 will be stronger than bond formed by overlap of  with
 with  .
.
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