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GATE 2017-2018 :: GATE Chemistry

  1. Consider the reaction sequence shown below:

    TsCl = p-toluenesulfonyl chloride 
    The oxidant X used in step 1 is
  2. A.
    CrO3
    B.
    OsO4
    C.
    NaIO4
    D.
    m-CPBA followed by NaOH

  3. Consider the reaction sequence shown below:

    TsCl = p-toluenesulfonyl chloride 
    The product is
  4. A.
    .

    B.
    .

    C.
    .

    D.
    .


  5. Consider the E1 reaction of tert-amyl halides from the energy profile given below.

    In the above reaction, X = Cl, Br or I. Based on the graph, identify the alkyl halides (R-X) as S1, S2 and S3
  6. A.
    S1 = R-Cl, S2 = R-Br and S3 = R-I
    B.
    S1 = R-I, S2 = R-Br and S3 = R-Cl
    C.
    S1 = R-Cl, S2 = R-I and S3 = R-Br
    D.
    S1 = R-I, S2 = R-Cl and S3 = R-Br

  7. Consider the E1 reaction of tert-amyl halides from the energy profile given below.

    Identify product P1 and its yield relative to P2
  8. A.
    P1 is M and is the major product
    B.
    P1 is N and is the minor product
    C.
    P1 is N and is the major product
    D.
    P1 is M and is the minor product

  9. A 20491 cm─1 laser line was used to excite oxygen molecules (made of 16O only) to obtain the rotational Raman spectrum. The resulting rotational Raman spectrum of oxygen molecule has the first Stokes line at 20479 cm─1.
    T he rotational constant (usually denoted as B) for the oxygen molecule is
  10. A.
    1.2 cm─1
    B.
    2.0 cm─1
    C.
    3.0 cm─1
    D.
    6.0 cm─1

  11. A 20491 cm─1 laser line was used to excite oxygen molecules (made of 16O only) to obtain the rotational Raman spectrum. The resulting rotational Raman spectrum of oxygen molecule has the first Stokes line at 20479 cm─1
    The next rotational Stokes line is expected at
  12. A.
    20467 cm─1
    B.
    20469 cm─1
    C.
    20471 cm─1
    D.
    20475 cm─1

  13. Hückel molecular orbital theory can be applied to the allene radical 
    CH2═CH─ĊH2 
    The secular determinant (where α , β and E have their usual meanings) is given by
  14. A.
    .

    B.
    .

    C.
    .

    D.
    .


  15. Hückel molecular orbital theory can be applied to the allene radical 
    CH2═CH─ĊH2 
    The possible values of E are
  16. A.
    α + √2β, α, α - √2β
    B.
    α + 2√2β, α, α - 2√2β
    C.
    α + β, α, α - β
    D.
    α + 2β, α, α - 2β

  17. If (1.001)1259 = 3.52 and (1.001)2062 = 7.85, then (1.001)3321 =
  18. A.
    2.23
    B.
    4.33
    C.
    11.37
    D.
    27.64

  19. One of the parts (A, B, C, D) in the sentence given below contains an ERROR. Which one of the following is INCORRECT
    I requested that he should be given the driving test today instead of tomorrow.
  20. A.
    requested that
    B.
    should be given
    C.
    the driving test
    D.
    instead of tomorrow