Bond Enthalpy and Dissociation Energy
Bond enthalpy is the energy required to break a bond in a molecule, influenced by bond order, hybridization, and s-character.
Why this shows up in the exam
You need to compare bond strengths and predict trends in bond dissociation energies.
How NEET tests this
Practise it
These are real questions from past NEET papers that test this exact idea.
Which one of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms? (a) Sigma-bond is stronger than a pi-bond. (b) Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively. (c) Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond. (d) Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard.
Push further
More challenging9 harder questions built from the past papers above — a step up in difficulty, with distractors designed so you can't get there by elimination. Written and checked by our reviewers, not from a real paper.
In the molecule N2 (nitrogen gas), the bond between the two nitrogen atoms is a triple bond. Given that the bond energy of a N≡N triple bond is 945 kJ/mol and a N-N single bond (sigma only) is 163 kJ/mol, what is the approximate average energy of a single N-N pi bond in N2?
More from Chemical Bonding and Molecular Structure
Molecular Orbital Theory
Molecular Orbital (MO) Theory explains bonding in molecules by combining atomic orbitals to form molecular orbitals, predicting bond order, magnetism, and stability.
Hybridization and Molecular Shape
Hybridization describes the mixing of atomic orbitals to form new hybrid orbitals, determining molecular geometry and bond angles.
VSEPR Theory and Molecular Geometry
Valence Shell Electron Pair Repulsion (VSEPR) theory predicts molecular shapes based on electron pair repulsions around the central atom.
Isoelectronic and Isostructural Species
Isoelectronic species have the same number of electrons, while isostructural species share the same molecular geometry.
Bond Length, Bond Order, and Related Properties
Bond order indicates the number of chemical bonds between a pair of atoms, influencing bond length, strength, and stability.
Sigma and Pi Bonds
Sigma (σ) and pi (π) bonds are types of covalent bonds formed by different orbital overlaps, affecting molecular structure and reactivity.