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For questions about chemical bonds (ionic/covalent/etc.), their properties (length, energy, angle, etc.) or their relation to other molecular properties (intermolecular forces/dipole moment/etc.). Do not confuse this tag with [lewis-structures], [dipole], [intermolecular-forces], etc.
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Hybridization in ethene
When a carbon is involved in a double bond (alkenes, carbonyls etc.), three of four orbitals are ${sp^2}$-hybridized, because the double bond consists of one $\pi$-bond and one $\sigma$-bond. … When a carbon is involved in a triple bond (alkynes, nitriles etc.) two of four orbitals are ${sp}$-hybridized, because the triple bond consists of two $\pi$-bonds and one $\sigma$-bond. …