Identify the R configuration. | vedclass

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(D) To determine the $R/S$ configuration,assign priorities to the four groups attached to the chiral center using Cahn-Ingold-Prelog $(CIP)$ rules.$1$

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(D) To determine the $R/S$ configuration,assign priorities to the four groups attached to the chiral center using Cahn-Ingold-Prelog $(CIP)$ rules.$1$. Assign priority $1$ to the group with the highest atomic number,and $4$ to the lowest.$2$. If the lowest priority group $(4)$ is on a horizontal line in the Fischer projection,the configuration is reversed (i.e.,clockwise is $S$ and counter-clockwise is $R$).Let's analyze option $D$:- The groups are $-COOH$ (priority $1$),$-NH_2$ (priority $2$),$-CH_3$ (priority $3$),and $-H$ (priority $4$).- The sequence $1$ $\rightarrow 2$ $\rightarrow 3$ is counter-clockwise.- Since the lowest priority group $(-H)$ is on a horizontal line,the configuration is reversed from counter-clockwise to $R$.

Identify the $R$ configuration.

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