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#C=C double bond

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The bond length of a C=C double bond is approximately:

The average bond length of a C=C double bond, as in ethene, is ~134 pm due to increased electron density from two shared pairs, shorter than a C-C single bond (~154 pm) but longer than a C#C triple bond (~120 pm).

Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Ionic Bonding - Lattice Enthalpy and Properties of Ionic Compounds