Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?

A) two singlets B) a singlet and a nonet C) a singlet and a decet D) a doublet and a decet A) two singlets B) a singlet and a nonet C) a singlet and a decet D) a doublet and a decet

Exam 13: Structure Determination

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband decoupled ¹³C NMR spectra. Number of signals:

(Essay)

4.8/5

(38)

Question 41

Treatment of tert-butyl alcohol with hydrogen chloride yields a mixture of tert-butyl chloride and 2-methylpropene. $\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { COH } \stackrel { \mathrm { HCl } } { \longrightarrow } \left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCl } + \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { C } = \mathrm { CH } _ { 2 }$ a) After chromatographic separation, how would you use $^1H$ NMR to help you decide which was which? b) How would the ${}^{13}C$ NMR for the two compounds differ?

(Essay)

4.9/5

(30)

Question 42

Which of the following does not involve the interaction of molecules with electromagnetic energy?

(Multiple Choice)

4.9/5

(39)

Question 43

The following questions pertain to the charting of NMR spectra.xa0 MATCH a term to each description below.xa0

Refer to instructions. __________ When looking at an NMR chart the right-hand part of the chart is the __________.

TMS

Refer to instructions. __________ The exact place on the chart at which a nucleus absorbs is called its __________.

high-field or upfield side

Refer to instructions. __________ The calibration standard for 1H and 13C NMR is:

MHz

Correct Answer:

Verified

Refer to instructions. __________ When looking at an NMR chart the right-hand part of the chart is the __________.

Refer to instructions. __________ The exact place on the chart at which a nucleus absorbs is called its __________.

Refer to instructions. __________ The calibration standard for 1H and 13C NMR is:

Refer to instructions. __________ The NMR charts are calibrated using an arbitrary scale that is divided into __________ units.

(Matching)

5.0/5

(48)

Question 44

Which of the following statements best describes the base peak in a mass spectrum?

(Multiple Choice)

4.9/5

(43)

Question 45

Instructions: Answer the following question(s) for the compound whose ¹H NMR spectra is shown below. C₄H₈O (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) Refer to instructions. Propose a structure for this compound.

(Essay)

4.8/5

(51)

Question 46

What is the horizontal axis of a mass spectrum?

(Multiple Choice)

4.9/5

(46)

Question 47

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. - Refer to instructions. The exact place on the chart at which a nucleus absorbs is called its .

(Multiple Choice)

4.9/5

(44)

Question 48

Nuclear magnetic resonance spectroscopy provides information about a molecule's: a. conjugated pi electron system b. size and formula. c. carbon-hydrogen framework. d. functional groups.

(Short Answer)

4.8/5

(39)

Question 49

Which structure of molecular formula C₄H₈Cl₂ fits the ¹H NMR and ¹³C NMR spectra shown below? (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)

(Multiple Choice)

4.9/5

(40)

Question 50

A compound with the molecular formula C₅H₁₂O produces only two singlets in the ¹H NMR spectrum. a) Propose a structure for this compound. b) How many signals would be present in the $^{13}C NMR$ for this structure?

(Essay)

4.8/5

(34)

Question 51

Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions. M⁺ at m/z = 216

(Multiple Choice)

4.8/5

(36)

Question 52

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. -Refer to instructions. __________ The calibration standard for ¹H and ¹³C NMR is:

(Multiple Choice)

4.9/5

(44)

Question 53

Cyclohexene and hex-2-yne both have the molecular formula, C₆H₁₀. a) How would you use infrared spectroscopy to distinguish between the two compounds b) How could the mass spectrum be used to distinguish between the two compounds?

(Essay)

4.7/5

(36)

Question 54

Which of the following bonds undergoes stretching at the highest frequency?

(Multiple Choice)

4.8/5

(48)

Question 55

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. - Refer to instructions. The NMR charts are calibrated using an arbitrary scale that is divided into units.

(Multiple Choice)

4.8/5

(34)

Question 56

Which of the following combinations of peaks appears in the ¹H NMR spectrum of 2-methylpropane?

(Multiple Choice)

4.8/5

(32)

Question 57

Instructions: Predict the splitting patterns you would expect for each proton in the molecules below: Predict:

(Essay)

4.9/5

(34)

Question 58

Which of the following compounds gives an infrared spectrum with a peak at strong 1730 cm^-1?

(Multiple Choice)

4.8/5

(33)

Question 59

When 2-bromopropane reacts with ethoxide ion, two products are formed; one is the product of S_N2 substitution and the other is the product of E2 elimination. Write the structures of both products, and tell how they could be distinguished using IR spectroscopy.

(Essay)

5.0/5

(32)

Question 60

Showing 41 - 60 of 64

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband decoupled ¹³C NMR spectra. Number of signals:

Which of the following does not involve the interaction of molecules with electromagnetic energy?

Which of the following statements best describes the base peak in a mass spectrum?

Instructions: Answer the following question(s) for the compound whose ¹H NMR spectra is shown below. C₄H₈O (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) Refer to instructions. Propose a structure for this compound.

What is the horizontal axis of a mass spectrum?

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. - Refer to instructions. The exact place on the chart at which a nucleus absorbs is called its .

Nuclear magnetic resonance spectroscopy provides information about a molecule's: a. conjugated pi electron system b. size and formula. c. carbon-hydrogen framework. d. functional groups.

Which structure of molecular formula C₄H₈Cl₂ fits the ¹H NMR and ¹³C NMR spectra shown below? (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)

A compound with the molecular formula C₅H₁₂O produces only two singlets in the ¹H NMR spectrum. a) Propose a structure for this compound. b) How many signals would be present in the $^{13}C NMR$ for this structure?

Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions. M⁺ at m/z = 216

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. -Refer to instructions. __________ The calibration standard for ¹H and ¹³C NMR is:

Cyclohexene and hex-2-yne both have the molecular formula, C₆H₁₀. a) How would you use infrared spectroscopy to distinguish between the two compounds b) How could the mass spectrum be used to distinguish between the two compounds?

Which of the following bonds undergoes stretching at the highest frequency?

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. - Refer to instructions. The NMR charts are calibrated using an arbitrary scale that is divided into units.

Which of the following combinations of peaks appears in the ¹H NMR spectrum of 2-methylpropane?

Instructions: Predict the splitting patterns you would expect for each proton in the molecules below: Predict:

Which of the following compounds gives an infrared spectrum with a peak at strong 1730 cm^-1?

When 2-bromopropane reacts with ethoxide ion, two products are formed; one is the product of S_N2 substitution and the other is the product of E2 elimination. Write the structures of both products, and tell how they could be distinguished using IR spectroscopy.

Structure and Bonding:acids and Bases

Alkanes: The Nature of Organic Compounds

Alkenes and Alkynes: the Nature of Organic Reactions

Reactions of Alkenes and Alkynes

Aromatic Compounds

Sterechemistry at Tetrahedral Centers

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols, Phenols, Ethers, and Their Sulfur Analogs

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution Reactions and Condensation Reactions

Amines

Biomolecules: Carbohydrates

Biomolecules: Amino Acids, Peptides, and Proteins

Biomolecules: Lipids and Nucleic Acids

The Organic Chemistry of Metabolic Pathways

Filters

Exam 13: Structure Determination

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband decoupled 13C NMR spectra. Number of signals:

Which of the following does not involve the interaction of molecules with electromagnetic energy?

Which of the following statements best describes the base peak in a mass spectrum?

Instructions: Answer the following question(s) for the compound whose 1H NMR spectra is shown below. C4H8O (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) Refer to instructions. Propose a structure for this compound.

What is the horizontal axis of a mass spectrum?

Nuclear magnetic resonance spectroscopy provides information about a molecule's: a. conjugated pi electron system b. size and formula. c. carbon-hydrogen framework. d. functional groups.

Which structure of molecular formula C4H8Cl2 fits the 1H NMR and 13C NMR spectra shown below? (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)

A compound with the molecular formula C5H12O produces only two singlets in the 1H NMR spectrum. a) Propose a structure for this compound. b) How many signals would be present in the 13CNMR^{13}C NMR13CNMR for this structure?

Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions. M+ at m/z = 216

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. -Refer to instructions. __________ The calibration standard for 1H and 13C NMR is:

Cyclohexene and hex-2-yne both have the molecular formula, C6H10. a) How would you use infrared spectroscopy to distinguish between the two compounds b) How could the mass spectrum be used to distinguish between the two compounds?

Which of the following bonds undergoes stretching at the highest frequency?

Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?

Instructions: Predict the splitting patterns you would expect for each proton in the molecules below: Predict:

Which of the following compounds gives an infrared spectrum with a peak at strong 1730 cm-1?

When 2-bromopropane reacts with ethoxide ion, two products are formed; one is the product of SN2 substitution and the other is the product of E2 elimination. Write the structures of both products, and tell how they could be distinguished using IR spectroscopy.

Structure and Bonding:acids and Bases

Alkanes: The Nature of Organic Compounds

Alkenes and Alkynes: the Nature of Organic Reactions

Reactions of Alkenes and Alkynes

Aromatic Compounds

Sterechemistry at Tetrahedral Centers

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols, Phenols, Ethers, and Their Sulfur Analogs

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution Reactions and Condensation Reactions

Amines

Biomolecules: Carbohydrates

Biomolecules: Amino Acids, Peptides, and Proteins

Biomolecules: Lipids and Nucleic Acids

The Organic Chemistry of Metabolic Pathways

Filters

Instructions: For each of the compounds below tell how many signals you would expect the molecule to have in its normal, broadband decoupled ¹³C NMR spectra. Number of signals:

Instructions: Answer the following question(s) for the compound whose ¹H NMR spectra is shown below. C₄H₈O (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/) Refer to instructions. Propose a structure for this compound.

Which structure of molecular formula C₄H₈Cl₂ fits the ¹H NMR and ¹³C NMR spectra shown below? (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)

A compound with the molecular formula C₅H₁₂O produces only two singlets in the ¹H NMR spectrum. a) Propose a structure for this compound. b) How many signals would be present in the $^{13}C NMR$ for this structure?

Instructions: Select the most reasonable formula for the compounds with the following mass spectral data. Refer to instructions. M⁺ at m/z = 216

Instructions: The following questions pertain to the charting of NMR spectra. MATCH a term to each description below. Place the letter of the term in the blank to the left of the description. -Refer to instructions. __________ The calibration standard for ¹H and ¹³C NMR is:

Cyclohexene and hex-2-yne both have the molecular formula, C₆H₁₀. a) How would you use infrared spectroscopy to distinguish between the two compounds b) How could the mass spectrum be used to distinguish between the two compounds?

Which of the following combinations of peaks appears in the ¹H NMR spectrum of 2-methylpropane?

Which of the following compounds gives an infrared spectrum with a peak at strong 1730 cm^-1?

When 2-bromopropane reacts with ethoxide ion, two products are formed; one is the product of S_N2 substitution and the other is the product of E2 elimination. Write the structures of both products, and tell how they could be distinguished using IR spectroscopy.