Which of the following structures represent t | vedclass

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(D) To determine if the structures are identical,we assign the $R/S$ configuration to the chiral center in each molecule.Priority order of groups: $-B

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$1, 2,$ and $3$

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(D) To determine if the structures are identical,we assign the $R/S$ configuration to the chiral center in each molecule.Priority order of groups: $-Br (1) > -Cl (2) > -CH_2CH_3 (3) > -CH_3 (4)$.For structure $1$: The lowest priority group $-CH_3$ is on the dashed bond (away from the viewer). The sequence $1$ $\rightarrow 2$ $\rightarrow 3$ is counter-clockwise,so it is '$S$'.For structure $2$: The lowest priority group $-Br$ is on the wedge bond (towards the viewer). The sequence $1$ $\rightarrow 2$ $\rightarrow 3$ is clockwise,but since the lowest priority group is on a wedge,the configuration is '$S$'.For structure $3$: The lowest priority group $-CH_3$ is on the wedge bond (towards the viewer). The sequence $1$ $\rightarrow 2$ $\rightarrow 3$ is clockwise,but since the lowest priority group is on a wedge,the configuration is '$S$'.Since all three structures have the '$S$' configuration,they represent the same molecule.

List-$I$ Isomeric pairs	List-$II$ Type of isomers
$A$. Propanamine and $N$-Methylethanamine	$I$. Metamers
$B$. Hexan-$2$-one and Hexan-$3$-one	$II$. Positional isomers
$C$. Ethanamide and Hydroxyethanimine	$III$. Functional isomers
$D$. $o$-nitrophenol and $p$-nitrophenol	$IV$. Tautomers

Which of the following structures represent the same molecule?

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