AP Chemistry
2.7 VSEPR and Hybridization
2.2 Intramolecular Force and Potential Energy
A student constructs a molecular model of allene.
\[ \text{H}_2\text{C}=\text{C}=\text{CH}_2 \]
The \(\text{C}=\text{C}=\text{C}\) skeleton is linear. Initially, the student constrains the planes containing the terminal \(\text{CH}_2\) groups to be coplanar. The constraint is then removed so that a terminal group can rotate about the \(\text{C}=\text{C}=\text{C}\) axis while the \(\sigma\)-bond lengths and bond angles remain essentially fixed. Which outcome and explanation are consistent with the molecule reaching a lower potential energy?
\[ \text{H}_2\text{C}=\text{C}=\text{CH}_2 \]
The \(\text{C}=\text{C}=\text{C}\) skeleton is linear. Initially, the student constrains the planes containing the terminal \(\text{CH}_2\) groups to be coplanar. The constraint is then removed so that a terminal group can rotate about the \(\text{C}=\text{C}=\text{C}\) axis while the \(\sigma\)-bond lengths and bond angles remain essentially fixed. Which outcome and explanation are consistent with the molecule reaching a lower potential energy?
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