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Identify a sugar (tetrose or pentose) from its reactions

This type of question, asked 4 times: 27 Jun 2022, 31 Jan 2023, 11 Apr 2023, 4 Apr 2026 S2. All 4 questions 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

    31 Jan 2023

    140
    Compound A, C5H10O5C_{5}H_{10}O_{5}, given a tetraacetate with AC2OAC_{2}O and oxidation of AA with Br2−H2OBr_{2}-H_{2}O gives an acid, C5H10O6C_{5}H_{10}O_{6}. Reduction of AA with HIHI gives isopentane. The possible structure of AA is

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  3. Question 3

    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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  4. Question 4

    4 Apr 2026 S2

    43
    A D-aldotetrose on oxidation with concentrated HNO3HNO_{3} resulted in an optically inactive dicarboxylic acid. The structure of the D-aldotetrose is :

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