In which of the following is the rotation aro | vedclass

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(A) The restriction of rotation around a $C-C$ bond depends on the bond order and the steric hindrance caused by substituents.$1$. $Ethane$ $(CH_3-CH_

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$Ethane$

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(A) The restriction of rotation around a $C-C$ bond depends on the bond order and the steric hindrance caused by substituents.$1$. $Ethane$ $(CH_3-CH_3)$ has a $C-C$ single bond,allowing free rotation.$2$. $Ethene$ $(CH_2=CH_2)$ has a $C=C$ double bond,which restricts rotation.$3$. $Acetylene$ $(CH \equiv CH)$ has a $C \equiv C$ triple bond,which further restricts rotation.$4$. $Hexachloroethane$ $(CCl_3-CCl_3)$ has a $C-C$ single bond,but the large $Cl$ atoms cause significant steric hindrance,restricting rotation compared to $Ethane$.Therefore,$Ethane$ has the least restricted rotation.

In which of the following is the rotation around the carbon-carbon bond least restricted?

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