The stereochemistry of this molecule is

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(D) To determine the stereochemistry,we assign priorities to the groups attached to the chiral centers at positions $1$ and $3$ using the Cahn-Ingold-

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$1S, 3R$

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(D) To determine the stereochemistry,we assign priorities to the groups attached to the chiral centers at positions $1$ and $3$ using the Cahn-Ingold-Prelog $(CIP)$ rules.At position $1$ (bearing $-Cl$): The priorities are $-Cl (1) > -C(2) (2) > -C(6) (3) > -H (4)$. Since the $-H$ is on a wedge (towards the viewer),the clockwise direction $(1$ $\rightarrow 2$ $\rightarrow 3)$ corresponds to the $S$ configuration.At position $3$ (bearing $-CH_3$): The priorities are $-C(2) (1) > -C(4) (2) > -CH_3 (3) > -H (4)$. Since the $-H$ is on a dash (away from the viewer),the clockwise direction $(1$ $\rightarrow 2$ $\rightarrow 3)$ corresponds to the $R$ configuration.Thus,the configuration is $1S, 3R$.

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