Question 1

Which of the following compounds will have the lowest wavenumber for carbonyl absorption?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) All of the above
F) C) and D)

Question 2

Which of the following information is primarily obtained from an IR spectrum?

Accepted Answer

A)  Conjugated p system present in a compound.
B)  Functional groups present in a compound.
C)  Molecular weight of a compound.
D)  The carbon and hydrogen framework of a compound.E) A) and B)
F) All of the above

Question 3

Which of the following statements is (are)  true about a compound that has molecular ion peaks in its mass spectrum at mass 170 and 172 and shows prominent peaks in its IR spectrum at 3150-3000 and 1600 cm-1?

Accepted Answer

A)  The compound is not pure.
B)  The compound contains a halogen.
C)  The compound contains an OH group and Csp3-H hybridized bonds.
D)  Both A (The compound is not pure)  and B (The compound contains a halogen)  are true statements.
E)  Both A (The compound is not pure)  and C (The compound contains an OH group and Csp3-H hybridized bonds)  are true statements.F) B) and D)
G) C) and D)

Question 4

Compared to a C-H bond, a C-D bond will vibrate where in the infrared spectrum?

Accepted Answer

A)  Higher molecular weight
B)  Lower molecular weight
C)  Lower wavenumbers
D)  Higher wavenumbersE) B) and C)
F) None of the above

Question 5

Which of the following statements is (are)  true about the IR spectrum of the compound drawn below?
-1 and 1720 cm-1. B) It shows absorptions at 3000-2850 cm-1 and 2150 cm-1. C) It shows absorptions at 2250 cm-1 and 1650 cm-1. D) It shows absorptions at 2250 cm-1 and 1720 cm-1. E) Both statements B (It shows absorptions at 3000-2850 cm-1 and 2250 cm-1)  and D (It shows absorptions at 2250 cm-1 and 1720 cm-1)  are true." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  It shows absorptions at 3000-3150 cm-1 and 1720 cm-1.
B)  It shows absorptions at 3000-2850 cm-1 and 2150 cm-1.
C)  It shows absorptions at 2250 cm-1 and 1650 cm-1.
D)  It shows absorptions at 2250 cm-1 and 1720 cm-1.
E)  Both statements B (It shows absorptions at 3000-2850 cm-1 and 2250 cm-1)  and D (It shows absorptions at 2250 cm-1 and 1720 cm-1)  are true.F) None of the above
G) A) and D)

Question 6

You are given a bottle of an organic liquid and told it must be either cyclohexane or 1-hexene.Which of the following statements is (are)  true about these two compounds?
 You are given a bottle of an organic liquid and told it must be either cyclohexane or 1-hexene.Which of the following statements is (are)  true about these two compounds?   A) The two compounds can be differentiated by their mass spectra because they will have molecular ion peaks at different m/z. B) 1-Hexene will show an absorption at 1650 cm-1 but cyclohexane will not. C) Both cyclohexane and 1-hexene will show C-H absorptions at about 2950 cm-1. D) Statements B (1-Hexene will show an absorption at 1650 cm-1 but cyclohexane will not)  and C (Both cyclohexane and 1-hexene will show C-H absorptions at about 2950 cm-1)  are both true. E) Statements A (The two compounds can be differentiated by their mass spectra because they will have molecular ions at different masses) , B (1-Hexene will show an absorption at 1650 cm-1 but cyclohexane will not) , and (Both cyclohexane and 1- hexene will show C-H absorptions at about 2950 cm-1)  are all true." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  The two compounds can be differentiated by their mass spectra because they will have molecular ion peaks at different m/z.
B)  1-Hexene will show an absorption at 1650 cm-1 but cyclohexane will not.
C)  Both cyclohexane and 1-hexene will show C-H absorptions at about 2950 cm-1.
D)  Statements B (1-Hexene will show an absorption at 1650 cm-1 but cyclohexane will not)  and C (Both cyclohexane and 1-hexene will show C-H absorptions at about 2950 cm-1)  are both true.
E)  Statements A (The two compounds can be differentiated by their mass spectra because they will have molecular ions at different masses) , B (1-Hexene will show an absorption at 1650 cm-1 but cyclohexane will not) , and (Both cyclohexane and 1- hexene will show C-H absorptions at about 2950 cm-1)  are all true.F) None of the above
G) A) and D)

Question 7

An alkyne C-H bond absorbs at higher wave number than an alkene C-H bond.What does this tell you about the strength of these two bonds?

Accepted Answer

A)  The alkene C-H bond is stronger.
B)  The alkyne C-H bond is stronger.
C)  The alkene C-C bond is stronger.
D)  The alkyne C-C bond is stronger.E) A) and B)
F) All of the above

Question 8

The functional group region of an infrared spectrum is:

Accepted Answer

A)  Where the cations appear
B)  Greater than or equal to 1500 cm-1
C)  Less than 1500 cm-1
D)  Greater than or equal to 2500 cm-1E) B) and C)
F) C) and D)

Question 9

Examine the IR below and classify the compound.

Accepted Answer

A)  Alcohol
B)  Aldehyde
C)  Amine
D)  Ketone
E)  Carboxylic acidF) A) and D)
G) A) and C)

Question 10

What type of signal(s)  would you observe in the mass and (or)  infrared spectrum of the following compound?
-1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  A signal at 95 amu
B)  A signal at 94 amu
C)  Two signals at 95 and 94 amu
D)  A signal at 3600-3200 cm-1E) None of the above
F) B) and C)

Question 11

Examine the IR below and classify the compound.

Accepted Answer

A)  Alkane
B)  Carboxylic acid
C)  Alcohol
D)  AlkeneE) A) and D)
F) A) and B)

Question 12

What type(s)  of molecular motion is (are)  observed using infrared spectroscopy?

Accepted Answer

A)  Stretching and bending
B)  Rotation and excitation
C)  Spin flipping
D)  FragmentationE) C) and D)
F) None of the above

Question 13

Stronger bonds will be found where in the infrared spectrum?

Accepted Answer

A)  Higher molecular weight
B)  Lower molecular weight
C)  Lower wavenumbers
D)  Higher wavenumbersE) A) and B)
F) None of the above

Question 14

Which of the following statements is (are)  true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm-1?

Accepted Answer

A)  The compound has a molecular mass of 104.
B)  The compound contains a C=O group and Csp3-H hybridized bonds.
C)  The compound contains an OH group and Csp3-H hybridized bonds.
D)  Both (The compound has a molecular mass of 104)  and (The compound contains a C=O group and Csp3-H hybridized bonds)  are true statements.
E)  Both (The compound has a molecular mass of 104)  and (The compound contains an OH group and Csp3-H hybridized bonds)  are true statements.F) B) and E)
G) A) and C)

Question 15

Why does an alkyne carbon-carbon triple bond vibrate at a higher wavenumber than an alkene carbon-carbon double bond?

Accepted Answer

A)  It is stronger.
B)  It is weaker.
C)  It has fewer hydrogens.
D)  It makes a less stable cation.E) All of the above
F) B) and C)

Exam 13: Mass Spectrometry and Infrared Spectroscopy

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm^-1?

Correct Answer
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Which of the following statements is (are) true about a compound that has molecular ion peaks in its mass spectrum at mass 170 and 172 and shows prominent peaks in its IR spectrum at 3150-3000 and 1600 cm^-1?

Correct Answer
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Compared to a C-H bond, a C-D bond will vibrate where in the infrared spectrum?

Correct Answer
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An alkyne C-H bond absorbs at higher wave number than an alkene C-H bond.What does this tell you about the strength of these two bonds?

Correct Answer
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Why does an alkyne carbon-carbon triple bond vibrate at a higher wavenumber than an alkene carbon-carbon double bond?

Correct Answer
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What type of signal(s) would you observe in the mass and (or) infrared spectrum of the following compound?

Correct Answer
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Examine the IR below and classify the compound.

Correct Answer
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Stronger bonds will be found where in the infrared spectrum?

Correct Answer
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What type(s) of molecular motion is (are) observed using infrared spectroscopy?

Correct Answer
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Examine the IR below and classify the compound.

Correct Answer
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Which of the following information is primarily obtained from an IR spectrum?

Correct Answer
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The functional group region of an infrared spectrum is:

Correct Answer
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Which of the following compounds will have the lowest wavenumber for carbonyl absorption?

Correct Answer
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You are given a bottle of an organic liquid and told it must be either cyclohexane or 1-hexene.Which of the following statements is (are) true about these two compounds?

Correct Answer
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Which of the following statements is (are) true about the IR spectrum of the compound drawn below?

Correct Answer
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Exam 13: Mass Spectrometry and Infrared Spectroscopy

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm-1?

Correct AnswerverifiedShow Answer

Which of the following statements is (are) true about a compound that has molecular ion peaks in its mass spectrum at mass 170 and 172 and shows prominent peaks in its IR spectrum at 3150-3000 and 1600 cm-1?

Correct AnswerverifiedShow Answer

Compared to a C-H bond, a C-D bond will vibrate where in the infrared spectrum?

Correct AnswerverifiedShow Answer

An alkyne C-H bond absorbs at higher wave number than an alkene C-H bond.What does this tell you about the strength of these two bonds?

Correct AnswerverifiedShow Answer

Why does an alkyne carbon-carbon triple bond vibrate at a higher wavenumber than an alkene carbon-carbon double bond?

Correct AnswerverifiedShow Answer

What type of signal(s) would you observe in the mass and (or) infrared spectrum of the following compound?

Correct AnswerverifiedShow Answer

Examine the IR below and classify the compound.

Correct AnswerverifiedShow Answer

Stronger bonds will be found where in the infrared spectrum?

Correct AnswerverifiedShow Answer

What type(s) of molecular motion is (are) observed using infrared spectroscopy?

Correct AnswerverifiedShow Answer

Examine the IR below and classify the compound.

Correct AnswerverifiedShow Answer

Which of the following information is primarily obtained from an IR spectrum?

Correct AnswerverifiedShow Answer

The functional group region of an infrared spectrum is:

Correct AnswerverifiedShow Answer

Which of the following compounds will have the lowest wavenumber for carbonyl absorption?

Correct AnswerverifiedShow Answer

You are given a bottle of an organic liquid and told it must be either cyclohexane or 1-hexene.Which of the following statements is (are) true about these two compounds?

Correct AnswerverifiedShow Answer

Which of the following statements is (are) true about the IR spectrum of the compound drawn below?

Correct AnswerverifiedShow Answer

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm^-1?

Correct Answer
verified

Which of the following statements is (are) true about a compound that has molecular ion peaks in its mass spectrum at mass 170 and 172 and shows prominent peaks in its IR spectrum at 3150-3000 and 1600 cm^-1?

Correct Answer
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