For the aldotetroses I-IV, the combination of TRUE statements, among P - T, is: I II III IV P = I and II are… · ABC26OR0491
Subject: Organic Chemistry · Chapter: Natural Products · Topic: Natural Products & – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Medium
For the aldotetroses I-IV, the combination of TRUE statements, among P - T, is: 
I 
II 
III 
IV P = I and II are diastereomers and II and III are enantiomers. Q = I and IV are mesomers and are optically inactive. R = I and III can be interconverted by a base catalysed isomerisation. S = only I and IV are $\mathrm{HIO_4}$ cleavable. T = I and III are D - sugars and II and IV are L - sugars.
I II III IV P = I and II are diastereomers and II and III are enantiomers. Q = I and IV are mesomers and are optically inactive. R = I and III can be interconverted by a base catalysed isomerisation. S = only I and IV are $\mathrm{HIO_4}$ cleavable. T = I and III are D - sugars and II and IV are L - sugars.(a)Q, R, T
(b)P, R, T
(c)Q, S, T
(d)P, Q, S
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
I is D-erythrose, II L-threose, III D-threose and IV L-erythrose. P is true: I/II are diastereomers and II/III enantiomers. R is true: I and III are C-2 epimers and interconvert in base. T is true. Q is false (aldotetroses are not meso) and S is false (all are HIO₄-cleavable) (b).
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