When the following aldohexose exists in its D-configuration, the total number of streoisomers in its pyranose form is:
$C H O - C H_{2} - C H O H - C H O H - C H O H - C H_{2} O H$

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Solution

D- form has $O H$ group in right hand side at the farthest achiral carbon to the carbonyl group.
In the pyranose form there are 3 chiral centres so there will be $2^{3} = 8$ sterioisomers

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