Biomolecules and Chemistry in Everyday Life - Result Question 32

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

(2012)

alt text

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Answer:

Correct Answer: 33. $(8)$

Solution:

  1. The D-form of given sugar is

<img src=“https://temp-public-img-folder.s3.amazonaws.com/sathee.prutor.images/sathee_image/cropped_2024_01_16_b4fdca9f34924034e8d8g-474_jpg_height_431_width_634_top_left_y_1102_top_left_x_1256.jpg"width="400">

Configurations at the three chiral carbons (starred) 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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