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  4. When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form, is

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Q. When the following aldohexose exists in its $D$-configuration, the total number of stereoisomers in its pyranose form, isChemistry Question Image

IIT JEEIIT JEE 2012Biomolecules

Solution:

The $D$-form of given sugar is
image
Configurations at the three chiral carbons (starred) can be changed maintaining $D$-configuration. Hence, the total number of stereoisomers of $D$-pyranose $=2^{3}=8$
Thus, the correct integer is $8$ .