Bond energy is the energy released when a bond is formed or the energy needed to break a bond ( a measure of strength of the bond) and bond length gives length of the bond, now we know that stronger the bond, closer the atoms are, ( lesser the bond lenght) so greater the bond enthalpy.
when you increase the number of hybrid orbitals, i.e. you go from sp to sp2 to sp3 , the bond length definitely increases and according to the data i have, the bond energy decreases with hybridisation.
For example:
in ethane, hybridisatrion of carbon = sp3, bond length 1.54 A and bond energy 377 kj/mol
ethene, hyb : sp2 , bond length : 1.33 A , bond energy 720 kj/mol
ethyne, hyb: sp, bond length : 1.20 A , bond energy 967 kj/mol
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