Question: In general, it is very difficult to rotate around a double bond. The barrier of rotation for most carbon-carbon double bonds is about 66 kcal/mol.

In general, it is very difficult to rotate around a double bond. The barrier of rotation for most carbon-carbon double bonds is about 66 kcal/mol. The barrier for rotation about the central bond in molecule A, however, is only about 13 kcal/mol. Explain why the rotation about this bond is considerably easier than most other double bonds.

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