When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form, is
`{:(CHO),(|),(CH_(2)),(|),(CHOH),(|),(CHOH),(|),(CHOH),(|),(CH_(2)OH):}`

Options

A. 4
B. 8
C. 16
D. none of these

Answer

B

Explanation

The D-form of given sugar is
`{:(" "CHO),(" |"),(" "CH_(2)),(" |"),(" "CHOH),(" |"),(" "CHOH),(" |"),(H-C-OH),(" |"),(" "CH_(2)OH):}" " overset("Cyclisation")to`

Configuration at the the three chiral carbons (C-1 ,C-3 and C-4 ) can be change maintaining D-configuration).
`:.` The total number of stereoisomers =`2^(2)=8`