Which Is More Stable ?
#1
Question 
In Chemical Bonding , One Type Formation Of Covalent Bond Occurs By Overlapping Of Atomic Orbitals {Sigma} (s-s , s-p ,p-p ) ,Taking Z-Axis As Reference Axis , The Order Of Stability Is :[ p-p > s-p > s-s ]
And Stability Is Directly Proportional To Bond Strength/Bond Energy/BDE .
Example Of : s-s Bond [ H2 Molecule ]
: s-p Bond [ HF Molecule ]
: p-p Bond [F2 Molecule]
"BUT"
Order Of Bond Strength/Bond Energy/BDE Of These Molecules Is :
HF (556 KJ/mol) > H2 (436 KJ/mol) > F2 (126 KJ/mol)
i.e [ s-p > s-s > p-p ]

HOW IS IT POSSIBLE ?

Please Suggest Your Respective Answers .
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