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CHM 332 > Quiz 3 > Flashcards

Quiz 3 Flashcards

1
Q

49) Which of the following statements is not true about electromagnetic radiation?

A) The velocity of light is directly proportional to the energy.

B) All molecules absorb electromagnetic radiation at some frequency.

C) Frequency is inversely proportional to wavelength.

D) Energy is directly proportional to frequency.

E) Energy is inversely proportional to wavelength.

A

A) The velocity of light is directly proportional to the energy.

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2
Q

50) Which of the following regions of the electromagnetic spectrum has the greatest energy per photon?

A) visible

B) microwave

C) radio

D) ultraviolet

E) infrared

A

D) ultraviolet

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3
Q

51) Which of the following normally occurs in a molecule when a photon of infrared light is absorbed?

A) An electron moves to an orbital of higher potential energy.

B) A transition between allowed vibrational energy states occurs.

C) An electron changes alignment in a magnetic field.

D) The molecule gains an electron.

E) The molecule loses an electron.

A

B) A transition between allowed vibrational energy states occurs.

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4
Q

54) In the electromagnetic spectrum, ________ frequencies, ________ wavenumbers, and ________ wavelengths are associated with high energy.

A) high, small, long

B) low, large, short

C) low, small, short

D) high, large, short

E) high, small, short

A

D) high, large, short

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5
Q

61) Which of the following are considered to be bending (in-plane) vibrations?

A) scissoring and wagging

B) scissoring and twisting

C) rocking and wagging

D) rocking and twisting

E) scissoring and rocking

A

E) scissoring and rocking

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6
Q

62) Which of the following solvents is best used in infrared spectroscopy?

A

B) II

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7
Q

63) Which of the infrared regions is considered to be the fingerprint region?

A) 4000cm-1 - 1000cm-1

B) 4000μm - 1000μm

C) 2200μm - 1000μm

D) 1000cm-1 - 400cm-1

E) 1000μm - 400μm

A

D) 1000cm-1 - 400cm-1

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8
Q

64) Which of the following is not a common bending vibration of a CH2 group?

A) flip

B) rock

C) scissor

D) twist

E) wag

A

A) flip

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9
Q

65) Which of the following increases the absorbance of a solution of phenol in ethanol?

A) increasing the amount of phenol in the solution

B) decreasing the amount of ethanol in the solution

C) decreasing the light path through the solution

D) both A and B

E) both B and C

A

D) both A and B

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10
Q

67) Which molecule below has a significant band in the IR at 3400 cm-1 (strong and broad)?

A) CH3CH2CH2OH

B) CH3C≡CCH2CH3

C) CH3CH2CH(NH2)CH3

D) (CH3)3N

E) CH3CO2CH2CH3

A

A) CH3CH2CH2OH

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11
Q

68) Which molecule below has a significant band in the IR at 2220 cm-1 (medium)?

A) CH3CH2CH2OH

B) CH3C≡CCH2CH3

C) CH3CH2CH(NH2)CH3

D) (CH3)3N

E) CH3CO2CH2CH3

A

B) CH3C≡CCH2CH3

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12
Q

69) Which molecule below has a significant band in the 1720 - 1780 cm-1 range of its IR spectrum?

A) CH3CH2CH2OH

B) CH3C≡CCH2CH3

C) CH3CH2CH(NH2)CH3

D) (CH3)3N

E) CH3CO2CH2CH3

A

E) CH3CO2CH2CH3

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13
Q

70) Which of the following statements best explains the information we can gain from infrared spectroscopy?

A) It allows us to determine the number of protons in a compound.

B) It allows us to determine the kinds of functional groups in a compound.

C) It allows us to determine the molecular weight and the mass of some fragments of a compound.

D) It allows us to determine the presence and nature of a carbocation in the compound.

E) It allows us to determine the presence and nature of a free radical in the compound.

A

B) It allows us to determine the kinds of functional groups in a compound.

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14
Q

71) Which compound would be expected to show intense IR absorption at 1715 cm-1?

A) CH3CH2CO2H

B) 1-hexene

C) 2-methylhexane

D) CH3CH2CH2NH2

A

A) CH3CH2CO2H

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15
Q

72) Which compound would be expected to show intense IR absorption at 1746 cm-1?

A) CH3CH2OCH2CH3

B) CH3CO2CH3

C) CH3CH2CCH

D) CH3CH2SCH3

A

B) CH3CO2CH3

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16
Q

73) Identify the bond with the lowest wavenumber in the IR spectrum.

A) C=O

B) C-O

C) O-H in alcohol

D) N-H

E) C-H

A

B) C-O

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17
Q

74) Which of the following wavenumbers corresponds to the bond shown below?

C trriple C

A) 1650 cm-1

B) 2100 cm-1

C) 1100 cm-1

D) 3300 cm-1

E) 2850 cm-1

A

B) 2100 cm-1

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18
Q

75) Identify the compound that has a formula of C5H10 and bending vibrations at 990 and 910 cm-1.

A) 1-pentene

B) cis-2-pentene

C) trans-2-pentene

D) 2-methyl-1-butene

E) 2-methyl-2-butene

A

A) 1-pentene

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19
Q

76) At what wavenumber will the C-H stretch involving an sp carbon appear?

A) 2700 cm-1

B) 2900 cm-1

C) 3100 cm-1

D) 3300 cm-1

E) 3500 cm-1

A

D) 3300 cm-1

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20
Q

77) Which of the following carbonyl groups exhibits the highest wavenumber in infrared spectroscopy?

A

C) III

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21
Q

78) Which compound’s carbonyl stretch occurs at the greatest wavenumber?

A) CH3CH2CH2CHO

B) CH3COCH2CH3

C) CH3CH2CONH2

D) CH3CH2CO2CH3

E) CH3CH2COCH2CH3

A

D) CH3CH2CO2CH3

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22
Q

79) Which compound’s carbonyl stretch occurs at the lowest wavenumber?

A) CH3CH2CH2CHO

B) CH3COCH2CH3

C) CH3CH2CONH2

D) CH3CH2CO2CH3

E) CH3CH2COCH2CH3

A

C) CH3CH2CONH2

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23
Q

84) Which compound has the lowest carbonyl absorption frequency in an infrared spectrum?

A) ester

B) ketone

C) amide

D) aldehyde

E) carboxylic acid

A

C) amide

24
Q

85) Which of the following functional groups typically exhibits a carbonyl stretch at the lowest frequency?

A) amide

B) ester

C) ketone

D) aldehyde

E) ether

A

A) amide

25
Q

86) Which of the following functional groups will exhibit no IR absorption at 1630 - 1780 cm-1 or at 3200 - 3550 cm-1?

A) an alcohol

B) an amide

C) a ketone

D) an aldehyde

E) an ether

A

E) an ether

26
Q

88) In which of the following molecules is the presence of the IR peak for CC not observed?

A

A

27
Q

89) Ethyne (HCCH) does not show IR absorption in the region 2000-2500 cm-1 because ________.

A) C-H stretches occur at lower energies

B) CC stretches occur at about 1640 cm-1

C) there is no change in the dipole moment when the CC bond in ethyne stretches

D) there is a change in the dipole moment when the CC bond in ethyne stretches

A

C) there is no change in the dipole moment when the CC bond in ethyne stretches

28
Q

90) Which of the following compounds has a vibration that is infrared inactive?

A) CH3—CC—H

B) H2O

C)

D) CO2

E) CO

A

D) CO2

29
Q

92) Which compound would be expected to show intense IR absorption at 2710 and 1705 cm-1?

A) CH3COCH2CH3

B) PhCOCH3

C) PhCHO

D) CH2CHCOCH3

A

C) PhCHO

30
Q

93) Which compound would be expected to show intense IR absorption at 2250 cm-1?

A) CH3CH2CH2CO2H

B) CH3CH2CH2CN

C) CH3CH2CH2CH2OH

D) CH3CH2CH2CONH2

A

B) CH3CH2CH2CN

31
Q

94) Which of the following species has a characteristic absorption at 2200 cm-1 in its IR spectrum?

A) PhCH2CN

B) PhCH2N(CH3)2

C) PhCH2CO2CH3

D) PhCH2CH2OH

E) PhCH2OCH3

A

A) PhCH2CN

32
Q

95) Which of the following species has a characteristic broad absorption at 3200-3500 cm-1 in its IR spectrum?

A) PhCH2CN

B) PhCH2N(CH3)2

C) PhCH2CO2CH3

D) PhCH2CH2OH

E) PhCH2OCH3

A

D) PhCH2CH2OH

33
Q

96) Which of the following species has a characteristic absorption at 1250 cm-1 in its IR spectrum?

A) PhCH2CN

B) PhCH2N(CH3)2

C) PhCH2CO2CH3

D) PhCH2CH2OH

E) PhCH2OCH3

A

C) PhCH2CO2CH3

34
Q

97) Which of the following carbon-hydrogen bonds exhibits the lowest wavenumber for a C—H stretch in infrared spectroscopy?

A

B

35
Q

98) Which compound would be expected to show intense IR absorption at 3300 cm-1?

A) CH3CCCH3

B) butane

C) 1-butene

D) CH3CH2CCH

A

D) CH3CH2CCH

36
Q

99) Which of the following species has a characteristic absorption at 3300 cm-1 in its IR spectrum?

A) (CH3)2CHCCH

B) (CH3)2CHN(CH3)2

C) (CH3)2CHCCCH3

D) (CH3)2CHCH=CH2

E) (CH3)2CHCO2CH3

A

A) (CH3)2CHCCH

37
Q

100) Which molecule below has two significant bands (medium and broad) in the 3300 - 3500 cm-1 range of its IR spectrum?

A) (CH3)3N

B) CH3CH2NH2

C) CH3CH2NH2

D) CH3CON(CH3)2

E) CH3OCH2CH2N(CH3)2

A

C) CH3CH2NH2

38
Q

101) Which molecule below has a significant band in the IR at 3300 cm-1 (medium and sharp)?

A) 1-pentene

B) cyclohexane

C) 2-heptyne

D) 1-pentyne

E) diethyl ether

A

D) 1-pentyne

39
Q

102) Which molecule below has two significant bands in the IR at 2720 cm-1 and 2820 cm-1 (medium)?

A) CH3COCH2CH

B) CH3CH2CO2CH3

C) CH2=CHCH2CH3

D) CH3CH2CH2CHO

E) CH3CH2CH2OH

A

D) CH3CH2CH2CHO

40
Q

109) In the infrared spectrum, a compound of formula C4H8O gave an absorption band at 1720 cm-1, but no bands at 2720 - 2830 and 3400 cm-1. What is the compound?

A) 2-butanone

B) butanal

C) cis-2-butenol

D) trans-2-butenol

E) 1-butenol

A

A) 2-butanone

41
Q

111) Identify the compound that has a formula of C4H9N and has one absorption band at 3400 cm-1 and a doublet at 1380 cm-1.

A) diethylamine

B) methylpropylamine

C) isopropylmethylamine

D) butylamine

E) dimethylethylamine

A

C) isopropylmethylamine

42
Q

112) Identify the compound that has a formula of C3H6O with a stretching vibration at 1050 cm-1 and an absorption band at 3400 cm-1, but no doublet at 1380 cm-1.

A) 1-propanol

B) 2-propanol

C) ethyl methyl ether

D) propen-1-ol

E) propen-2-ol

A

A) 1-propanol

43
Q

113) A mixture of two compounds give absorption bands at 1470, 1595, 1700, 2720, and 2740 cm-1. What compounds are present?

A) aldehyde + benzene

B) ketone + benzene

C) ester + benzene

D) carboxylic acid + benzene

E) anhydrice + benzene

A

A) aldehyde + benzene

44
Q

116) Which of the following methods is most suitable for studying conjugation in molecules?

A) infrared

B) NMR

C) mass spectrometry

D) X-ray

E) UV visible

A

E) UV visible

45
Q

114) In the UV-visible spectrum of (E)-1,3,5-hexatriene, the lowest energy absorption corresponds to ________.

A) a π to π* transition

B) a σ to π* transition

C) a π to σ* transition

D) a σ to σ* transition

E) a σ to π transition

A

A) a π to π* transition

46
Q

115) Absorption of UV-visible energy by a molecule results in ________.

A) vibrational transitions

B) electronic transitions

C) rotational transitions

D) nuclear transitions

E) none of the above

A

B) electronic transitions

47
Q

117) Which of the following compounds exhibits the highest λmax in UV spectra?

A

D) IV

48
Q

118) Which of the following compounds absorbs the longest wavelength of UV-visible light?

A) (E)-2-butene

B) (Z)-2-butene

C) 1-hexene

D) (Z)-1,3-hexadiene

E) (E)-1,3,5-hexatriene

A

E) (E)-1,3,5-hexatriene

49
Q

119) An increase in conjugation is correlated with ________ in the energy of the LUMO, ________ in the energy of the HOMO, and ________ in lmax.

A) a decrease, an increase, a decrease

B) a decrease, an increase, an increase

C) an increase, a decrease, a decrease

D) an increase, a decrease, an increase

E) an increase, an increase, a decrease

A

B) a decrease, an increase, an increase

An increase in conjugation is correlated with a decrease in the energy of the LUMO, an increase in the energy of the HOMO, and an increase in lmax.

50
Q

121) Identify the compound with the shortest λmax in an UV spectrum.

A) 1-decene

B) 1,3-decadiene

C) 1,3,5-decatriene

D) 1,4-decadiene

E) 1,3,5,7-decatetraene

A

A) 1-decene

51
Q

122) Identify the compound with the longest λmax in an UV spectrum.

A) benzene

B) phenol

C) phenolate ion

D) aniline

E) anilinium ion

A

C) phenolate ion

52
Q

123) Which color is observed when a sample absorbs light at 650 nm?

A) yellow

B) orange

C) red

D) violet

E) greenish-blue

A

E) greenish-blue

53
Q

124) When a solution of an organic compound absorbs light whose wavelength is 400 nm, the solution appears ________.

A) yellow

B) red

C) purple

D) blue

E) white

A

A) yellow

54
Q

125) When a solution of an organic compound absorbs light whose wavelength is 700 nm, the solution appears ________.

A) yellow

B) bluish-green

C) red

D) orange

E) purple

A

B) bluish-green

55
Q

126) The pKa of a compound whose acidic or basic form absorbs UV or visible light can be determined spectroscopically since ________.

A) lmax always decreases as acidic form is converted to basic

B) the pKa is the same as the pH at which half of the total absorbance increase occurs

C) absorbance of the basic form is always twice that of the acidic form

D) absorbance of the acidic form is always twice that of the basic form

E) delocalization always leads to a decrease in acidity

A

B) the pKa is the same as the pH at which half of the total absorbance increase occurs

CHM 332 (12 decks)

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