Quiz 3.21 Flashcards
1
Q
- 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
2
Q
- 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
3
Q
- 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
4
Q
- 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
5
Q
- 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
6
Q
- 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
7
Q
- 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
8
Q
- 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
9
Q
- Which of the following bonds (circled) gives a very weak or no stretching absorption in the infrared spectrum?
A
A. 1
10
Q
- Which of the following bonds gives the weakest peak in the infrared spectrum for a stretching vibration?
A
B. 2
13
Q
- 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
14
Q
- Which of the following bonds (circled) vibrates at the highest frequency?
A
D. 4
15
Q
- Which of the following bonds (circled) gives the weakest absorbance in the infrared spectrum?
A
B. 2
16
Q
- 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
17
Q
- 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
20
Q
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
