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

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Solution

The D – form of given sugar is

Configurations at the three chiral carbons (started) can be changed maintaining D – configuration. Hence, the total number of steroisomers of D – pyranose $= 2^{3} = 8$
Thus, the correct integer is 8.

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When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form is (numeral) ___

$\begin{matrix} CHO | C H_{2} | CHOH | CHOH | CHOH | C H_{2} O H \end{matrix}$

C H O - C H_{2} - C H O H - C H O H - C H O H - C H_{2} O H

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