quiz 1

1. 1A molecule with alternating single and double bonds would tend to absorb energy in what portion of the electromagnetic spectrum?

   1. AIR (a)
   2. BGamma Ray (b)
   3. CX-RAY c
   4. Dmicrowave d
   5. EUV e
2. 22 H's in positions in a molecule where replacing either would give non-super imposable mirror images are said to be:

   1. Aenantiotopic a
   2. Bdiastereotopic b
   3. Cequivalent c
   4. Dnonequivalent d
   5. EA and C only e
   6. FB and D only f
3. 3What compound is the standar "zero" reference in both H and C NMR?

   1. ASi(CH3)4 a
   2. BD20 b
   3. CCDCL3 c
   4. DC6H6 d
   5. ENone of the above e
4. 4What occurs to the molecule when it is hit by a high energy electron in mass spec?

   1. AThe electron bounces off taking another electron with it a
   2. BThe electron leaves some energy behind b
   3. CThe molecular soecies left is a cation c
   4. DThe molecular species left is a radical d
   5. EAll of the above e
   6. FA and B only f
5. 5Which of the following is not true regarding NMR spectroscopy?

   1. AChemical shifts depend on the type of nuclei involved a
   2. BChemical shifts depend on the type of bonds bewteen nuclei b
   3. CRadio frequency pulses cause the spinning nuclei "line up" c
   4. Dexternal magnetic field causes the spinng nuclei to "flip" d
   5. EA and B only e
   6. FC and D only f
6. 6How many H peaks would be seen in the spectrum for the structure at the right?

   1. A5 a
   2. B7 b
   3. C8 c
   4. D9 d
   5. E19 e
7. 7Deuterated water (D20) is used in NMR primarily for what purpose(S)?

   1. Areference for chemical shifts a
   2. Bproton exchange studies b
   3. Csolvent since it doesn't show up c
   4. Dconformational studies d
   5. EA and C only e
   6. FB and D only f
8. 8WHICH OF THE FOLLOWING IS TREUE FOR MASS SPECTROSCOPY?

   1. Aodd M1+ peaks indicate an odd number of nitrogen a
   2. Bboth fragments from any one breakage are equally likely to carry the radical b
   3. Cthe molecular ion peak is the highest mass c
   4. Dthe molecular ion peak is the highest intensity d
9. 9broad, deep "peaks" at 3000 cm-1 in an IR spectrum is probably due to which functional group?

   1. A-C a
   2. B-OH b
   3. C-O c
   4. D-NH3 d
   5. E-CN e
10. 10Peaks in UV/vis spectrum tend to be very broad because:

    1. Aa large number of double bonds involve more molecular orbitals a
    2. Ba large number of molecular orbitals gives smaller energy gaps b
    3. Ca large number of vibrational states exist within the molecular orbitals c
    4. Da large number of possible HOMOs and LUMOs exist within a molecule d

11. 11How many 13C peaks should be seen in the broad-band decoupled spectrum of the structure at the right?

    1. A8 a
    2. B4 b
    3. C3 c
    4. D2 d
    5. E1 e
12. 12A mass spec of a compund gave peak at 118 of 57.7% of the base peak. It also had a peak at 120 of 2.6% of the base peak.THis compound probably includes:

    1. AS a
    2. BBr b
    3. CCl c
    4. Dp d
    5. EN e
13. 13Which form of electromagnetic radiation possesses the lowest energy?

    1. Arays a
    2. Bradio b
    3. CX-ray c
    4. Dmicrwaves d
    5. Evisible e
14. 14Whcih is used in H NMR as a mesure of the # of H giving rise to the signal ?

    1. Aarea under the peak a
    2. Bheight of peak b
    3. Cpeak splitting (triplet) c
    4. Dcoupling constant d
15. 15A prominent peak at M1- -18 in a mass spec susggests:

    1. Aether a
    2. Balkane b
    3. Calcohol c
    4. Dketone d
    5. Eprimary amine e
16. 16A mass spectrophotometer sorts ions based on their :

    1. Amass a
    2. Bcharge b
    3. Cmusical ability c
    4. Dmass/charge d
17. 17Why does peak height/area in 13C NMR not correlate to the number of equivalent C's like it does in H1 NMR?

    1. Acarbonyls do not Fourier Transform Well a b
    2. Bdistribution of 13C is not even
    3. Coutside peaks in multiplets get lost in the background c
    4. Dspin-spin coupling disorts the peak area d
    5. EA and C only e
    6. FC and D only f
18. 18Which of the following would not theoretically be seen in the splitting patterns for the 1H NMR signals for the molecules if Jab< Jbc

    1. Atybe b splits type a into a doublet a
    2. Btype b splits type c into a doublet b
    3. Ctype a splits tybe b into a heptet then tyoe c splits those into triplets c
    4. Dtype c splits tybe b into a triplet then tyoe a splits those into heptets d

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Test sobre quiz 1 , creado por Gia Gonzalez el 28/01/2019.

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Gia Gonzalez

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