DP Chemistry Questionbank

• Syllabus

Topic 21: Measurement and analysis

Sub sections and their related questions

21.1 Spectroscopic identification of organic compounds

• 15M.3.hl.TZ1.2b.iii: Explain the presence of a doublet in the high-resolution proton nuclear magnetic resonance (1H...
• 15M.3.hl.TZ1.2b.iv: One isomer of A has only one signal in its \(^{\text{1}}{\text{H}}\) NMR spectrum. Deduce the...
• 15M.3.hl.TZ2.2b: Outline why the signal at 1.0 ppm is a triplet.
• 15M.3.hl.TZ2.2c: Suggest why it is necessary to include an internal reference standard in a sample when its...
• 14M.3.hl.TZ1.2b: The mass spectrum, infrared spectrum and details of the \(^{\text{1}}{\text{H}}\,{\text{NMR}}\)...
• 14N.3.hl.TZ0.1c: \(^{\text{1}}{\text{H}}\,{\text{NMR}}\) spectroscopy is often very useful in distinguishing...
• 13N.3.hl.TZ0.2c: Peak B shows the following splitting pattern in the high-resolution spectrum. Explain the...
• 13M.3.hl.TZ1.A3c: Predict the splitting pattern for the peak at a chemical shift of 2.4 ppm.
• 13M.3.hl.TZ2.A4a: The \(^{\text{1}}{\text{H}}\,{\text{NMR}}\) spectrum of one of the intermediate compounds formed...
• 13M.3.hl.TZ2.A4b.i: State the number of peaks in the \(^{\text{1}}{\text{H}}\,{\text{NMR}}\) spectrum of aspirin...
• 13M.3.hl.TZ2.A4b.ii: Describe the splitting pattern for each of the peaks given in (b) (i).
• 13M.3.hl.TZ2.A4b.iii: State how the infrared spectra of aspirin and ibuprofen will differ in the region 1700–1750 cm–1.
• 12N.3.hl.TZ0.A3b: Analyse the splitting pattern of each peak and determine the relative positions of hydrogen atoms...
• 12N.3.hl.TZ0.A3c: Using the information from (a) and (b), deduce the structural formula of the organic compound.
• 10N.3.hl.TZ0.A2c: (i)     Identify the bonds responsible for the peaks A, B and C in the IR spectrum of...
• 09N.3.hl.TZ0.A1a.ii: Explain why tetramethylsilane (TMS) is used as a reference standard in...
• 09N.3.hl.TZ0.A2c.iii: Explain the splitting pattern of the peak at chemical shift 4.1 ppm.
• 09M.3.hl.TZ1.A2a: A feature of some \(^{\text{1}}{\text{H}}\,{\text{NMR}}\) spectra is the electron-withdrawing...
• 09M.3.hl.TZ2.A3b.iii: Predict the splitting pattern of the peak with the biggest area.
• 11M.3.hl.TZ2.A2b.vi: \({\text{HCOOC(C}}{{\text{H}}_{\text{3}}}{{\text{)}}_{\text{3}}}\) is an isomer of X. For the...
• 11M.3.hl.TZ2.A2b.vii: ...
• 12M.3.hl.TZ1.A1d: Peaks in a \(^{\text{1}}{\text{H}}\,{\text{NMR}}\) spectrum are measured relative to a reference...
• 16M.1.hl.TZ0.40: ...
• 16M.2.hl.TZ0.5c: Two signals occur in the 1H NMR spectrum of compound A. Deduce their expected chemical shift and...
• 16N.1.hl.TZ0.40: Which property explains why tetramethylsilane, Si(CH3)4, can be used as a reference standard in...
• 16N.2.hl.TZ0.1f: Predict the 1HNMR data for ethanedioic acid and ethane-1,2-diol by completing the table.
• 17M.1.hl.TZ1.40: Which technique is used to determine the bond lengths and bond angles of a molecule? A.    ...
• 17M.2.hl.TZ1.6b.ii: Deduce the splitting patterns in the 1H NMR spectrum of C2H5Cl.
• 17M.2.hl.TZ1.6b.iii: Explain why tetramethylsilane (TMS) is often used as a reference standard in 1H NMR.
• 17M.1.hl.TZ2.40: Which technique can be used to identify bond length and bond angle? A.     1H NMR...
• 17M.2.hl.TZ2.7a.i: Deduce what information can be obtained from the 1H NMR spectrum.
• 17M.2.hl.TZ2.7a.iii: Suggest the structural formula of this compound.
• 17M.3.hl.TZ2.21c.ii: Predict the chemical shift and the splitting pattern seen for the hydrogens on the carbon atom...
• 17N.1.hl.TZ0.39: Which compound gives this 1H NMR spectrum? A. CH3CH2OCH2CH3 B. CH3CH2OH C. CH3CH2CH3 D....
• 18M.1.hl.TZ1.40: Which would be the most effective method to distinguish between liquid propan-1-ol and...
• 18M.2.hl.TZ1.1l.ii: Predict the splitting pattern of the 1H NMR spectrum of urea.
• 18M.2.hl.TZ1.1l.iii: Outline why TMS (tetramethylsilane) may be added to the sample to carry out 1H NMR spectroscopy...
• 18M.2.hl.TZ2.9a.ii: Mass spectra A and B of the two isomers are given. Explain which spectrum is produced by each...
• 18M.3.hl.TZ2.27b: Predict the chemical shifts and integration for each signal in the 1H NMR spectrum for ethanol...