The molecules represented by the two structur | vedclass

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(A) To determine the relationship between the two structures,we assign the $R/S$ configuration to each chiral center.For the first structure (left): -

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identical

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(A) To determine the relationship between the two structures,we assign the $R/S$ configuration to each chiral center.For the first structure (left): - At the top chiral center,the priority order is $-OH > -CH(Br)(C_2H_5) > -CH_3 > -H$. The configuration is $S$.- At the bottom chiral center,the priority order is $-Br > -CH(OH)(CH_3) > -C_2H_5 > -H$. The configuration is $R$.For the second structure (right): - The molecule is rotated by $180^{\circ}$ in the plane. After rotation,the configuration of the chiral centers remains the same as the first structure.- Both molecules have the same configuration at each chiral center,therefore they are identical.

The molecules represented by the two structures shown in the image are:

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