L-isomer of tetrose X (C4H8O4) gives positive Schiff's test and has two chiral carbons. On acetylation. X yields…
Biomolecules · Class 12 · JEE Main Previous Year Question
L-isomer of tetrose gives positive test and has two chiral carbons. On acetylation. yields triacetate. also undergoes following reactions
'X' is
- a
Option a
- b✓
Option b
- c
Option c
- d
Option d
Option b
Step 1: Structure of Tetrose X — A tetrose with four carbons and two chiral centers must be either erythrose or threose.
Step 2: Reactivity Analysis — Acetylation giving a triacetate indicates three groups. Since it yields a chiral compound upon reduction with , it must be threose (erythrose gives an achiral meso-polyol).
Step 3: Determining L-Isomer — L-Threose has the on the left at the highest chiral carbon (C3), matching structure (b).
Key Point: Stereochemical outcomes of reduction reveal the symmetry or lack thereof in the original molecule.
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