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The prefixes 'erythro' and 'threo' are u...

The prefixes 'erythro' and 'threo' are used for distinguishing a pair of enantiomers containing two chiral carbon atoms when two of the atoms or groups on each chiral carbon atom are the same while the third is different. The stereoisomer, in which the two identical groups are on the same side of the Fischer projection formula, is called the erythro isomer while the isomer, in which the two identical groups are on the opposite sides of the Fischer projection formula, is called the threo isomer.
Erythro isomer among the following is :

A

B

C

D

Text Solution

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The correct Answer is:
B
When two identical groups are in the opposite side in, Fischer projection, such structure are known as threo.
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