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CHM 332 > Quiz 3.21 > Flashcards

Quiz 3.21 Flashcards

1
Q
  1. Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?
    A. radio waves
    B. ultraviolet
    C. infrared
    D. visible
A

B. ultraviolet

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2
Q
  1. Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the longest wavelength?
    A. radio waves
    B. ultraviolet
    C. infrared
    D. visible
A

A. radio waves

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3
Q
  1. What range of wavelengths corresponds to the infrared region of the electromagnetic spectrum?
    A. 200-400 nm
    B. 400-700 nm
    C. 2.5-50 mm
    D. 2-10 mm
A

C. 2.5-50 mm

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4
Q
  1. Which of the following processes takes place upon absorption of infrared radiation?
    A. bond vibration
    B. electron excitation
    C. nuclear spin flip
    D. electron spin flip
A

A. bond vibration

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5
Q
  1. What are the units of wavenumber, , in infrared spectroscopy?
    A. cm
    B. cm-1
    C. Jmol-1
    D. none, wavenumber is a dimensionless quantity
A

B. cm-1

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6
Q
  1. Which of the following relationships is not valid as applied to infrared spectroscopy?
    A. wavenumber = 1/l (in cm)
    B. DE = h n
    C. DE = l n
    D. n = 4.12 Ö(K/m)
A

C. DE = l n

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7
Q
  1. Which of the following laws relates the frequency of a stretching vibration to the masses and spring constant of a simple harmonic oscillator?
    A. Pan’s law
    B. Hooke’s law
    C. Peter’s law
    D. Barrie’s law
A

B. Hooke’s law

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8
Q
  1. What is required for a bond to give an infrared absorption?
    A. a change in bond length during vibration
    B. a change in bond angle during vibration
    C. a change in bond dipole during vibration
    D. a change in reduced mass during vibration
A

C. a change in bond dipole during vibration

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9
Q
  1. Which of the following bonds (circled) gives a very weak or no stretching absorption in the infrared spectrum?
A

A. 1

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10
Q
  1. Which of the following bonds gives the weakest peak in the infrared spectrum for a stretching vibration?
A

B. 2

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13
Q
  1. Which of the following bonds undergoes stretching at the highest frequency?
    A. C=O
    B. C-O
    C. C=C
    D. C-C
A

A. C=O

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14
Q
  1. Which of the following bonds (circled) vibrates at the highest frequency?
A

D. 4

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15
Q
  1. Which of the following bonds (circled) gives the weakest absorbance in the infrared spectrum?
A

B. 2

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16
Q
  1. Which of the following bonds undergoes stretching at the highest frequency?
    A. O-H
    B. C-H
    C. C=O
    D. CºC
A

A. O-H

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17
Q
  1. Which of the following carbon-carbon bonds undergoes stretching at the highest frequency?
    A. sp3 C - sp3 C
    B. alkene sp2 C - sp2 C
    C. arene sp2 C - sp2 C
    D. CºC
A

D. CºC

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20
Q
  1. Which of the following bonds gives rise to a strong absorbance at approximately 1630-1820 cm-1 in the infrared spectrum?
    A. C=O
    B. C-O
    C. C=C
    D. CºC
A

A. C=O

21
Q
  1. Which of the following bonds gives rise to an absorbance at approximately 2700-3300 cm-1 in the infrared spectrum?
    A. CºC
    B. C=O
    C. C=C
    D. C-H
A

D. C-H

22
Q
  1. Which of the following bonds gives rise to a strong, broad, absorbance at approximately 3200-3650 cm-1 in the infrared spectrum?
    A. C=O
    B. O-H
    C. C=C
    D. C-H
A

B. O-H

23
Q
  1. Which of the following bonds gives rise to a medium strength absorbance at approximately 1600-1680 cm-1 in the infrared spectrum?
    A. C-H
    B. C-C
    C. C=C
    D. CºC
A

C. C=C

24
Q
  1. Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm-1 (medium); but does not have peaks at 1630-1820 (strong)?
A

C. 3

25
Q
  1. Which of the following compounds gives an infrared spectrum with a peak in the range of 1630-1820 cm-1 (strong peak), but does not have peaks at 3200-3650 or 1000-1250 cm-1?
A

B. 2

26
Q
A

A. 1

27
Q
A

D. 4

28
Q
A

A. 1

29
Q
A

B. 2

30
Q
A

C. 3

31
Q
A

B. 2

32
Q
A

A. 1

33
Q
A

A. 1

34
Q
A

C. 3

35
Q
A

B. 2

36
Q
  1. Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1630-1820 cm-1 (strong, broad) and 1000-1250 cm-1; but does not have peaks at 3200-3650 cm-1?
    A. alcohol
    B. aldehyde or ketone
    C. ether
    D. ester
A

D. ester

37
Q
  1. Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1630-1820 cm-1 (strong, broad), but does not have peaks at 3200-3650 or 1000-1250 cm-1
    A. alcohol
    B. aldehyde or ketone
    C. ether
    D. ester
A

B. aldehyde or ketone

38
Q
  1. Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm-1 (strong), but does not have peaks at 1630-1820 or 1000-1250 cm-1
    A. alcohol
    B. aldehyde or ketone
    C. ether
    D. ester
A

A. alcohol

39
Q
  1. Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1000-1250 cm-1 (strong), but does not have peaks 3200-3650 at 1630-1820 or cm-1?
    A. alcohol
    B. aldehyde or ketone
    C. ether
    D. ester
A

C. ether

CHM 332 (12 decks)

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