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L-tetrose C4H8O4 that reduces Tollens' reagent and forms a triacetate: identify it

The same question, asked 2 times: 27 Jun 2022, 11 Apr 2023. Every wording below, oldest first.

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  1. Question 1

    27 Jun 2022

    49
    L-isomer of a compound ' AA ' (C4H8O4)\left( C_{4}H_{8}O_{4} \right) gives a positive test with [Ag(NH3)2]+\left\lbrack Ag\left( NH_{3} \right)_{2} \right\rbrack^{+}. Treatment of 'A' with acetic anhydride yield triacetate derivative. Compound ' AA ' produces an optically active compound (b) and an optically inactive compound (c) on treatment with bromine water and HNO3HNO_{3} respectively, compound (a)(a) is

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  2. Question 2

    11 Apr 2023

    31
    LL-isomer of tetrose X(C4H8O4)X\left( C_{4}H_{8}O_{4} \right) gives positive Schiff's test and has two chiral carbons. On acetylation, 'X' yields triacetate. 'X' also undergoes following reactions. X is

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