Which of the following structures has an R-co | vedclass

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(C) To determine the $R/S$ configuration,we assign priorities to the groups attached to the chiral center based on the Cahn-Ingold-Prelog $(CIP)$ rule

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(C) To determine the $R/S$ configuration,we assign priorities to the groups attached to the chiral center based on the Cahn-Ingold-Prelog $(CIP)$ rules: $1$ (highest) to $4$ (lowest).For option $C$ (butan-$2$-ol): The groups are $-OH$ (priority $1$),$-CH_2CH_3$ (priority $2$),$-CH_3$ (priority $3$),and $-H$ (priority $4$).In the Fischer projection of option $C$,the $-H$ atom is on the horizontal bond. When the lowest priority group $(-H)$ is on a horizontal bond,the configuration is reversed: clockwise $(1$ $\rightarrow 2$ $\rightarrow 3)$ corresponds to $S$,and counter-clockwise corresponds to $R$.In structure $C$,the sequence $1 (-OH)$ $\rightarrow 2 (-CH_2CH_3)$ $\rightarrow 3 (-CH_3)$ is counter-clockwise. Since $-H$ is horizontal,this is $R$-configuration.

Which of the following structures has an $R$-configuration at the chiral center?

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