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GATE 2017-2018 :: GATE Chemistry

GATE Chemistry - Practice Test Paper 1
  1. I n the proton decoupled 13C NMR spectrum of 7-norbornanone, the number of signals obtained is
    2. A.
    7
    B.
    3
    C.
    4
    D.
    5

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  2. Identify the most probable product in the given reaction


    3. A.
    .
    B.
    .
    C.
    .
    D.
    .

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  3. In the cyclization reaction given below, the most probable product formed is

    4. A.
    .
    B.
    .
    C.
    .
    D.
    .

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  4. If Δy and Δpy are the uncertainties in the y-coordinate and the y component of the momentum of a particle respectively, then, according to uncertainty principle ΔyΔpy is (ћ = h/2π and h is Planck's constant)
    5. A.
    ≥ ћ
    B.
    > Ñ›/2
    C.
    > Ñ›
    D.
    ≥ ћ/2

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  5. The average length of a typical α-helix comprised of 10 amino acids is
    6. A.
    10 Ã…
    B.
    15 Ã…
    C.
    36 Ã…
    D.
    54 Ã…

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  6. Number of thymine residues in a 5000 kb DNA containing 23% guanine residues is
    7. A.
    2.70 * 106
    B.
    2.70 * 107
    C.
    1.35 * 106
    D.
    1.35 * 107

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  7. Shown below is a Hammett plot obtained for the reaction


    The change in slope of the plot indicates that
    8. A.
    the reaction does not follow linear free energy relationship
    B.
    electrons are being withdrawn from the transition state in the mechanism
    C.
    electrons are being donated to the transition state in the mechanism
    D.
    the mechanism of the reaction is changing

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  8. T he ratio of relative intensities of the two molecular ion peaks of methyl bromide (CH3Br) in the mass spectrum is
    9. A.
    M+ : (M+2)+ = 1:3
    B.
    M+ : (M+2)+ = 3:1
    C.
    M+ : (M+2)+ = 1:1
    D.
    M+ : (M+2)+ = 1:2

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  9. A disaccharide that will not give Benedict's test and will not form osazone is
    10. A.
    maltose
    B.
    lactose
    C.
    cellobiose
    D.
    sucrose

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  10. Choose the allowed transition
    11. A.
    1Σg+ → 3Σu+
    B.
    1Σg+ → 3Σu-
    C.
    1Σg+ → 1Σu+
    D.
    1Σg+ → 1Σu-

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