Which atomic orbitals overlap to form the carbon-carbon $\sigma$ bonding molecular orbital of acetylene, C₂H₂?

Name: Which atomic orbitals overlap to form the carbon-carbon $\sigma$ bonding molecular orbital of acetylene, C 2 H 2 ?
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The carbon-carbon sigma (σ) bond in acetylene is formed by the overlap of two carbon sp hybrid orbitals. Therefore, the atomic orbitals that overlap to form the C-C σ bond are the two carbon sp orbitals, which are represented by Csp + Csp, as given in choice B.

Which Atomic Orbitals Overlap to Form the Carbon-Carbon σ\sigmaσ Bonding Molecular Orbital of Acetylene, C2H2? A) Csp2 + Csp2

Which Atomic Orbitals Overlap to Form the Carbon-Carbon $\sigma$ Bonding Molecular Orbital of Acetylene, C₂H₂?
A) Csp² + Csp²