Which of the following has the lowest barrier | vedclass

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(C) The rotational barrier is determined by steric hindrance and the electronic nature of the bond. $A$: Cyclopentane has a cyclic structure,and rotat

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n-Butane (bond between $C_2$ and $C_3$)

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(C) The rotational barrier is determined by steric hindrance and the electronic nature of the bond. $A$: Cyclopentane has a cyclic structure,and rotation about a $C-C$ bond is restricted by the ring strain. $B$: Buta$-1,3-$diene has partial double-bond character between $C_2$ and $C_3$ due to conjugation,leading to a high rotational barrier. $C$: $n$-Butane $(CH_3-CH_2-CH_2-CH_3)$ has a simple $sp^3-sp^3$ single bond with minimal steric hindrance compared to the other options,resulting in the lowest rotational energy barrier. $D$: $2,3-$Dimethylbutane has significant steric repulsion between the bulky methyl groups during rotation,leading to a higher barrier than $n$-butane.

Which of the following has the lowest barrier to rotation about the indicated bond?

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