Chapter 5: Q.60 (page 209)
How is each compound related to the simple sugar D-erythrose? Is it an enantiomer,diastereomer, or identical?
a.
b.
c.
Short Answer
a. D-erythrose and compound a are diastereomers.
b. D-erythrose and compound b are identical molecules.
c. D-erythrose and compound c are enantiomers.
Step by step solution
Erythrose
Erythrose is a kind of saccharide comprising aldehyde and belongs to the aldose family.It contains several isomers, and one among them is D-erythrose.
Enantiomer and diastereomer
The molecules possess similar shapes in the case of enantiomers, whereas diastereomers possess different shapes. Enantiomers occur in pairs, and diastereomers can be numerous molecules.
Comparison of D-erythrose with compound a
Consider the comparison of D-erythrose with compound a.
Comparison of D-erythrose with compound a
The figure given above shows that the configuration is similar at one stereocenter, and it is different at another stereocenter. Hence, these compounds are diastereomers.
Comparison of D-erythrose with compound b
Consider the comparison of D-erythrose with compound b.
Comparison of D-erythrose with compound b
In the figure given above, it is observed that the configuration is similar at both the stereocenters. Hence, these molecules are identical.
Comparison of D-erythrose with compound c
Consider the comparison of D-erythrose with compound c.
The configuration at both the stereocenters is different in the above compounds. Hence, these compounds are enantiomers
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