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(A) The given structures are Fischer projections of two chiral molecules.Let's assign the configuration $(R/S)$ to the chiral centers.For the first st

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Enantiomers

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(A) The given structures are Fischer projections of two chiral molecules.Let's assign the configuration $(R/S)$ to the chiral centers.For the first structure (left): The chiral centers are at $C_2$ and $C_3$.At $C_2$: The priority order is $-OH > -CH(OH)C_2H_5 > -CH_3 > -H$. The configuration is $S$.At $C_3$: The priority order is $-OH > -CH(OH)CH_3 > -C_2H_5 > -H$. The configuration is $S$.For the second structure (right): The chiral centers are at $C_2$ and $C_3$.At $C_2$: The configuration is $R$.At $C_3$: The configuration is $R$.Since the configurations are $(2S, 3S)$ and $(2R, 3R)$,they are non-superimposable mirror images of each other.Therefore,they are enantiomers.

What is the relationship between the two given compounds?

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