L-isomer of tetrose gives positive test and has two chiral carbons. On acetylation. yields triacetate. also undergoes following reactions

'X' is

Question

L-isomer of tetrose  gives positive  test and has two chiral carbons. On acetylation.  yields triacetate.  also undergoes following reactions

'X' is

Canvas Classes · Accepted Answer

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 rev

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