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NEET-XII-Chemistry

Previous Year Paper year:2017

with Solutions - page 2
Qstn# 28 Prvs-QstnNext-Qstn
  • #28
    Consider the reactions :

    Identify A, X, Y and Z
    (1) A-Ethanol, X-Acetaldehyde, Y-Butanone Z-Hydrazone
    (2) A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-Hydrazine
    (3) A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide
    (4) A-Ethanal, X-Ethanol, Y-But-2-enal., Z-Semicarbazone
    digAnsr:   4
    Ans : (4)
    Sol.
    Cu
    573 K X
    Tollen's
    A Y
    Z
    O
    ||
    NH2-NH-C-NH2
    (Oxidation)
    Reagent Silver Mirror
    OH/Δ
    Θ
    aldol condensation
    semicarbazide
    X is CH3CH2-OH (Ethanol)
    A is CH3-CH=O (Ethanal)
    Y is CH3-CH=CH-CH=O (But-2-enal)
    Z is CH3-CH=N-NH-C-NH2
    ||
    O
    (Acetaldehyde-semicarbazone)