Topic 21: Measurement and analysis

Mass spectra A and B of the two isomers are given.

Explain which spectrum is produced by each compound using section 28 of the data booklet.

Mass spectra A and B of the two isomers are given.

Explain which spectrum is produced by each compound using section 28 of the data booklet.

Mass spectra A and B of the two isomers are given.

Explain which spectrum is produced by each compound using section 28 of the data booklet.

Which compound produces the following ¹H NMR spectrum?

^{[Spectral Database for Organic Compounds, SDBS. SDBS Compounds and Spectral Search. [graph] Available at:
https://sdbs.db.aist.go.jp [Accessed 3 January 2019].]}

A.  propanal

B.  propanone

C.  propane

D.  methlypropane

Which compound produces the following ¹H NMR spectrum?

^{[Spectral Database for Organic Compounds, SDBS. SDBS Compounds and Spectral Search. [graph] Available at:
https://sdbs.db.aist.go.jp [Accessed 3 January 2019].]}

A.  propanal

B.  propanone

C.  propane

D.  methlypropane

Identify the wavenumber of one peak in the IR spectrum of benzoic acid, using section 26 of the data booklet.

Identify the wavenumber of one peak in the IR spectrum of benzoic acid, using section 26 of the data booklet.

Identify the wavenumber of one peak in the IR spectrum of benzoic acid, using section 26 of the data booklet.

Which can be identified using infrared (IR) spectroscopy?

A. functional groups

B. molar mass

C. 3-D configuration

D. bond angle

Which can be identified using infrared (IR) spectroscopy?

A. functional groups

B. molar mass

C. 3-D configuration

D. bond angle

Which is the ¹H NMR spectrum of tetramethylsilane, TMS, (CH₃)₄Si?

Which is the ¹H NMR spectrum of tetramethylsilane, TMS, (CH₃)₄Si?

Which organic compound has the ¹H NMR shown?

^{Source: Spectral Database for Organic Compounds, SDBS, n.d. [online] Available at:
https://sdbs.db.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi [Accessed 6 October 2021].}

A.  Methanal

B.  Ethanoic acid

C.  Methyl ethanoate

D.  Propanoic acid

Which organic compound has the ¹H NMR shown?

^{Source: Spectral Database for Organic Compounds, SDBS, n.d. [online] Available at:
https://sdbs.db.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi [Accessed 6 October 2021].}

A.  Methanal

B.  Ethanoic acid

C.  Methyl ethanoate

D.  Propanoic acid

Predict the splitting pattern of the ¹H NMR spectrum of urea.

Predict the splitting pattern of the ¹H NMR spectrum of urea.

Predict the splitting pattern of the ¹H NMR spectrum of urea.

Outline why TMS (tetramethylsilane) may be added to the sample to carry out ¹H NMR spectroscopy and why it is particularly suited to this role.

Outline why TMS (tetramethylsilane) may be added to the sample to carry out ¹H NMR spectroscopy and why it is particularly suited to this role.

Outline why TMS (tetramethylsilane) may be added to the sample to carry out ¹H NMR spectroscopy and why it is particularly suited to this role.

Predict the chemical shifts and integration for each signal in the ¹H NMR spectrum for ethanol using section 27 of the data booklet.

Predict the chemical shifts and integration for each signal in the ¹H NMR spectrum for ethanol using section 27 of the data booklet.

Predict the chemical shifts and integration for each signal in the ¹H NMR spectrum for ethanol using section 27 of the data booklet.

Identify the spectroscopic technique that is used to measure the bond lengths in solid benzoic acid.

Identify the spectroscopic technique that is used to measure the bond lengths in solid benzoic acid.

Identify the spectroscopic technique that is used to measure the bond lengths in solid benzoic acid.

Deduce the splitting pattern you would expect for the signals in a high resolution ¹H NMR spectrum.

2.3 ppm:

9.8 ppm:

Deduce the splitting pattern you would expect for the signals in a high resolution ¹H NMR spectrum.

2.3 ppm:

9.8 ppm:

Deduce the splitting pattern you would expect for the signals in a high resolution ¹H NMR spectrum.

2.3 ppm:

9.8 ppm:

X-ray crystallography of a metal crystal produces a diffraction pattern of bright spots.

Using X-rays of wavelength 1.54 × 10⁻¹⁰ m, the first bright spots were produced at an angle θ of 22.3° from the centre.

Calculate the separation between planes of atoms in the lattice, in meters, using section 1 of the data booklet.

X-ray crystallography of a metal crystal produces a diffraction pattern of bright spots.

Using X-rays of wavelength 1.54 × 10⁻¹⁰ m, the first bright spots were produced at an angle θ of 22.3° from the centre.

Calculate the separation between planes of atoms in the lattice, in meters, using section 1 of the data booklet.

Which compound with the molecular formula ${\mathrm{C}}_4{\mathrm{H}}_8\mathrm{O}$ has this high resolution ${}_1\mathrm{H} \mathrm{NMR}$?

From: libretexts.org. Courtesy of Chris Schaller, Professor (Chemistry)
at College of Saint Benedict/Saint John’s University.

A.  but-3-en-2-ol, ${\mathrm{CH}}_2=\mathrm{CHCH}\left(\mathrm{OH}\right){\mathrm{CH}}_3$

B.  butanal, ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CHO}$

C.  butanone, ${\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{CH}}_3$

D.  but-3-en-1-ol, ${\mathrm{CH}}_2={\mathrm{CHCH}}_2{\mathrm{CH}}_2\mathrm{OH}$

Which compound with the molecular formula ${\mathrm{C}}_4{\mathrm{H}}_8\mathrm{O}$ has this high resolution ${}_1\mathrm{H} \mathrm{NMR}$?

From: libretexts.org. Courtesy of Chris Schaller, Professor (Chemistry)
at College of Saint Benedict/Saint John’s University.

A.  but-3-en-2-ol, ${\mathrm{CH}}_2=\mathrm{CHCH}\left(\mathrm{OH}\right){\mathrm{CH}}_3$

B.  butanal, ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CHO}$

C.  butanone, ${\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{CH}}_3$

D.  but-3-en-1-ol, ${\mathrm{CH}}_2={\mathrm{CHCH}}_2{\mathrm{CH}}_2\mathrm{OH}$

Deduce the number of signals and chemical shifts with splitting patterns in the ¹H NMR spectrum of ethoxyethane. Use section 27 of the data booklet.

Deduce the number of signals and chemical shifts with splitting patterns in the ¹H NMR spectrum of ethoxyethane. Use section 27 of the data booklet.

Deduce the number of signals and chemical shifts with splitting patterns in the ¹H NMR spectrum of ethoxyethane. Use section 27 of the data booklet.

Which compound produces the following ¹H NMR spectrum?

SDBS, National Institute of Advanced Industrial Science and Technology (AIST).

A.  Propane

B.  Propanone

C.  Propanal

D.  2,2-dimethylpropane

Which compound produces the following ¹H NMR spectrum?

SDBS, National Institute of Advanced Industrial Science and Technology (AIST).

A.  Propane

B.  Propanone

C.  Propanal

D.  2,2-dimethylpropane

What information can be deduced from the splitting pattern of ¹H NMR signals?

A.  total number of hydrogen atoms in a compound

B.  number of hydrogen atoms on adjacent atom(s)

C.  functional group on which hydrogen atoms are located

D.  number of hydrogen atoms in a particular chemical environment

What information can be deduced from the splitting pattern of ¹H NMR signals?

A.  total number of hydrogen atoms in a compound

B.  number of hydrogen atoms on adjacent atom(s)

C.  functional group on which hydrogen atoms are located

D.  number of hydrogen atoms in a particular chemical environment

Predict the number of ¹H NMR signals, and splitting pattern of the –CH₃ seen for propanone (CH₃COCH₃) and propanal (CH₃CH₂CHO).

Predict the number of ¹H NMR signals, and splitting pattern of the –CH₃ seen for propanone (CH₃COCH₃) and propanal (CH₃CH₂CHO).

Predict the number of ¹H NMR signals, and splitting pattern of the –CH₃ seen for propanone (CH₃COCH₃) and propanal (CH₃CH₂CHO).

Deduce the number of signals that you would expect in the ¹H NMR spectrum of nitrobenzene and the relative areas of these.

Deduce the number of signals that you would expect in the ¹H NMR spectrum of nitrobenzene and the relative areas of these.

Deduce the number of signals that you would expect in the ¹H NMR spectrum of nitrobenzene and the relative areas of these.

Deduce the splitting pattern in the ¹H NMR spectrum for 1-bromopropane.

Deduce the splitting pattern in the ¹H NMR spectrum for 1-bromopropane.

Deduce the splitting pattern in the ¹H NMR spectrum for 1-bromopropane.

What information can be deduced about a compound through X-ray crystallography?

A.  Boiling and melting points

B.  Bond angles

C.  Bonds that will break during fragmentation

D.  Ionization energy

What information can be deduced about a compound through X-ray crystallography?

A.  Boiling and melting points

B.  Bond angles

C.  Bonds that will break during fragmentation

D.  Ionization energy

State the oxidation state of sulfur in copper (II) sulfate.

State the oxidation state of sulfur in copper (II) sulfate.

State the oxidation state of sulfur in copper (II) sulfate.

State the oxidation state of sulfur in copper (II) sulfate.

State the oxidation state of sulfur in copper (II) sulfate.

State the oxidation state of sulfur in copper (II) sulfate.