Match items of Row I with those of Row II.

Row I: Four cyclic sugar structures (P, Q, R, S)

Row II:
(i) -D-(−) Fructofuranose
(ii) -D-(−) Fructofuranose
(iii) -D-(−) Glucopyranose
(iv) -D-(−) Glucop

Question

Match items of Row I with those of Row II.

Row I: Four cyclic sugar structures (P, Q, R, S)

Row II:
(i) -D-(−) Fructofuranose
(ii) -D-(−) Fructofuranose
(iii) -D-(−) Glucopyranose
(iv) -D-(−) Glucopyranose

Correct match is

Canvas Classes · Accepted Answer

Identifying cyclic sugar structures:

Key rules for identifying anomers:

For glucopyranose (6-membered ring, D-glucose):
- -D-glucopyranose: anomeric –OH at C1 is axial (trans to –CH₂OH at C5)
- -D-glucopyranose: anomeric –OH at C1 is equatorial (cis to –CH₂OH at C5)

For fructofuranose (5-membered ring, D-fructose):
- -D-fructofuranose: anomeric –OH at C2 is on the same side as C6 (–CH₂OH)
- -D-fructofuranose: anomeric –OH at C2 is on the opposite side from C6

Based on the structures shown in

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