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AP Chemistry
2.7 VSEPR and Hybridization
AdvancedMCQDrawing RepresentationsConceptual13.4k
A grayscale schematic diagram illustrating the orbital overlap in propadiene along a horizontal axis. Three carbon atoms are arranged linearly and labeled from left to right as \(\text{C}_1\), \(\text{C}_2\), and \(\text{C}_3\). The central carbon \(\text{C}_2\) displays two mutually perpendicular unhybridized \(p\)-orbitals: a vertical pair of lobes (oriented along the \(y\)-axis) and a perpendicular pair of lobes projecting forward and backward (oriented along the \(z\)-axis). The left terminal carbon \(\text{C}_1\) has a single vertical unhybridized \(p\)-orbital whose lobes overlap side-by-side (indicated by parallel dashed lines) with the vertical lobes of \(\text{C}_2\). The right terminal carbon \(\text{C}_3\) has a single unhybridized \(p\)-orbital oriented along the \(z\)-axis whose lobes overlap side-by-side with the \(z\)-axis lobes of \(\text{C}_2\). Two \(\text{C-H}\) bonds on \(\text{C}_1\) lie in the horizontal plane (one wedge, one dash), while two \(\text{C-H}\) bonds on \(\text{C}_3\) lie in the vertical plane (solid lines pointing up-right and down-right). No other particles, labels, text, or annotations appear.
Orbital overlap model of \(\pi\) bonding in \(\text{C}_3\text{H}_4\)
A model of the bonding and orbital overlap in propadiene (allene, \(\text{C}_3\text{H}_4\)) is shown above, where unhybridized \(p\)-orbitals are depicted forming \(\pi\) bonds between adjacent carbon atoms. The \(\text{C-C-C}\) bond angle is \(180^\circ\).

Based on the orbital representation, which of the following best describes the geometry and spatial arrangement of the hydrogen atoms in the molecule?

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