NTA Abhyas NEET2020ChemistryChemical Bonding and Molecular StructurePractice
Which statement is NOT correct? (According to Valence bond theory)
Options
- AA sigma(σ) bond is weaker than a π - b o n d
- BA sigma bond is stronger than a π - b o n d
- CA double bond is stronger than a single bond
- DA double bond is shorter than a single bond
Correct answer
A. A sigma(σ) bond is weaker than a π - b o n d
Step-by-step solution
A σ - bond is stronger than a π - bond. Sigma σ bonds are formed by head on overlap of unhybridised s - s , p - p o r s - p orbitals and hybridized orbitals s p , s p 2 , s p 3 , s p 3 d a n d s p 3 d 2 . Hence, σ bond are strong bonds. Where as Pi π - bonds are formed by side ways overlap of unhybridised p and d orbitals. Hence π bonds are weak bonds.