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While cleaning the organic stockroom,a student found a bottle of ethanol labeled "Denatured with Benzene." He decided to determine the concentration of benzene in the ethanol by acquiring the UV spectrum of the liquid in a 2.0 cm cell.The spectrum exhibited an absorption band at 260 nm which was attributable to benzene,and the absorbance of this band was 0.69.In a reference source,the student found that the molar absorptivity of this benzene band in ethanol was 230 M-1cm-1.Show how the student calculated the concentration of the benzene in the ethanol.

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A = clε c = A/lε c =...

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Which region of the electromagnetic spectrum,IR or UV,contains photons of the higher energy?

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What technique can be used to determine the molecular formula of a compound?

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High resol...

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An infrared wavelength of 4.48μm is equivalent to a wavenumber of ________ cm-1.

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Which of the following structures will give a base peak of 43 in mass spectrometry?


A) Which of the following structures will give a base peak of 43 in mass spectrometry? A) B) CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub> C) D) E) none of the above
B) CH3CH2CH2CH2CH2CH3
C) Which of the following structures will give a base peak of 43 in mass spectrometry? A) B) CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub> C) D) E) none of the above
D) Which of the following structures will give a base peak of 43 in mass spectrometry? A) B) CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub> C) D) E) none of the above
E) none of the above

F) B) and D)
G) C) and D)

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Which compound's carbonyl stretch occurs at the greatest wavenumber?


A) CH3CH2CH2CHO
B) CH3COCH2CH3
C) CH3CH2CONH2
D) CH3CH2CO2CH3
E) CH3CH2COCH2CH3

F) All of the above
G) A) and B)

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Which has the higher speed in a vacuum,ultraviolet or infrared light?

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They have ...

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Which of the following m/z values is least intense in the mass spectrum of 1-chloropropane?


A) 80
B) 79
C) 78
D) 65
E) 63

F) A) and B)
G) C) and D)

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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

F) A) and D)
G) C) and D)

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


A) CH3CH2CO2H
B) 1-hexene
C) 2-methylhexane
D) CH3CH2CH2NH2

E) B) and C)
F) A) and B)

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Which of the following carbon-hydrogen bonds exhibits the lowest wavenumber for a C-H stretch in infrared spectroscopy? Which of the following carbon-hydrogen bonds exhibits the lowest wavenumber for a C-H stretch in infrared spectroscopy? A) I B) II C) III D) IV E) V


A) I
B) II
C) III
D) IV
E) V

F) A) and E)
G) B) and D)

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McLafferty rearrangement involves a


A) 3-membered transition state.
B) 4-membered transition state.
C) 5-membered transition state.
D) 6-membered transition state.
E) 7-membered transition state.

F) C) and D)
G) C) and E)

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The C The C C stretch in the following molecule shows at A) 3300-2500 cm<sup>-1</sup>. B) 1680-1600 cm<sup>-1</sup>. C) 1780-1650 cm<sup>-1</sup>. D) 2260-2100 cm<sup>-1</sup>. E) none of the above. C stretch in the following molecule shows at The C C stretch in the following molecule shows at A) 3300-2500 cm<sup>-1</sup>. B) 1680-1600 cm<sup>-1</sup>. C) 1780-1650 cm<sup>-1</sup>. D) 2260-2100 cm<sup>-1</sup>. E) none of the above.


A) 3300-2500 cm-1.
B) 1680-1600 cm-1.
C) 1780-1650 cm-1.
D) 2260-2100 cm-1.
E) none of the above.

F) B) and E)
G) B) and D)

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Which of the following m/z values is the base peak for benzyl alcohol? Which of the following m/z values is the base peak for benzyl alcohol? A) 77 B) 108 C) 91 D) 17 E) 52


A) 77
B) 108
C) 91
D) 17
E) 52

F) A) and D)
G) D) and E)

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Which of the following is/are true about the MS of 1-bromobutane?


A) Peaks of approximately equal intensity are observed at m/z 136 and 138.
B) The major fragmentation occurs by cleavage of the C-Br bond.
C) The most intense peak occurs at m/z 43.
D) both A and B
E) both B and C

F) B) and D)
G) All of the above

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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

F) B) and E)
G) C) and D)

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Which of the following statements best explains the information we can gain from mass spectrometry?


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.

F) A) and E)
G) A) and D)

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Which region of the electromagnetic spectrum,IR or X-ray,is characterized by waves of lower frequency?

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Which of the following is the base peak for the compound below? Which of the following is the base peak for the compound below? A) 77 B) 92 C) 15 D) 57 E) 43


A) 77
B) 92
C) 15
D) 57
E) 43

F) A) and C)
G) All of the above

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Give the fragment(s) that corresponds to a m/z charge of 58 for ethylpropylamine.You may choose more than one answer.


A) Give the fragment(s) that corresponds to a m/z charge of 58 for ethylpropylamine.You may choose more than one answer. A) B) C) D) E)
B) Give the fragment(s) that corresponds to a m/z charge of 58 for ethylpropylamine.You may choose more than one answer. A) B) C) D) E)
C) Give the fragment(s) that corresponds to a m/z charge of 58 for ethylpropylamine.You may choose more than one answer. A) B) C) D) E)
D) Give the fragment(s) that corresponds to a m/z charge of 58 for ethylpropylamine.You may choose more than one answer. A) B) C) D) E)
E) Give the fragment(s) that corresponds to a m/z charge of 58 for ethylpropylamine.You may choose more than one answer. A) B) C) D) E)

F) A) and E)
G) D) and E)

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