Least hindered rotation about carbon-carbon b | vedclass

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(A) The rotation about a $C-C$ bond is most free in $Ethane$ $(CH_3-CH_3)$ because it contains a single sigma bond.$Ethylene$ $(CH_2=CH_2)$ has a doub

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$Ethane$

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(A) The rotation about a $C-C$ bond is most free in $Ethane$ $(CH_3-CH_3)$ because it contains a single sigma bond.$Ethylene$ $(CH_2=CH_2)$ has a double bond,and $Ethyne$ $(CH \equiv CH)$ has a triple bond,both of which restrict rotation due to the presence of pi bonds.$Hexachloroethane$ $(CCl_3-CCl_3)$ has bulky chlorine atoms that cause significant steric hindrance,making rotation difficult.Therefore,the least hindered rotation is observed in $Ethane$.

Least hindered rotation about carbon-carbon bond is observed in

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