TMA 3 CHM309 ORGANIC SPECTROSCOPY

1. One of these is not the application of mass spectrometry
2. Relative molecular mass and structural dimension
3. Mass spectrometry is usually interfaced with gas chromatography to provide structural information about the component of mixture as elute from the column
4. May be used as detector in gas chromatography
5. Mass spectrometry is useful as a detector in nuclear magnetic resonance spectroscopy

The answer is D. Mass spectrometry is useful as a detector in nuclear magnetic resonance spectroscopy

2. One of these is not an ionisation technique used in mass spectrometer
3. Electroassay ionisation
4. Electron impact
5. Chemical ionisation
6. Tak atom bombardment

The answer is A. Electroassay ionisation

3. Which of these appropriately describe the base peak?
4. The most abundant ion in a mass spectrum that is arbitrarily given abundance of 100%
5. The ion formed by the loss of one electron from the molecules
6. The most abundant peak on the far right hand side of the spectrurm
7. It mass is the same as the relative molecular mass of the compound

The answer is A. The most abundant ion in a mass spectrum that is arbitrarily given abundance of 100%

4. Which of these is not appropriate as a role of interpretation of mass spectra
5. Unsaturated site rule
6. The nitrogen rule
7. Small neutral molecules are often loss during fragmentation
8. Melafferty management is not sustainable in carbonyl compounds

The answer is D. Melafferty management is not sustainable in carbonyl compounds

5. Methane sequentially undergoes three stage of chemical ionisation. which of these reaction is correct?
6. CH₄ + e^– + CH₄⁺ + 2e^–
7. CH₄⁺ + CH₄ + CH₅⁺ + CH₃
8. CH₅⁺ + MH + MH⁺ CH₄
9. ṨṨ C[2]H-[6] N⁺

The answer is D. ṨṨ C[2]H-[6] N⁺

6. Which of these is not a main component of mass spectroscopy?
7. Sample outlet system
8. Ion source
9. Analyser
10. Detector

The answer is A. Sample outlet system

7. (CH₃)₃ SiOH is a neutral fragment lost from one of these molecules?
8. Ketones
9. Acetamide
10. Trimethylsilyl ester
11. Trimethylsilyl

The answer is C. Trimethylsilyl ester

8. In chemical ionisation, in mass spectrometry, ions are produced by collision between sample molecules and _____ generated by reagent gas
9. Atoms
10. Ions
11. Electrons
12. Position

The answer is B. Ions

9. The ____ is a plot of relative abundance versus mass-charge ratio
10. Chromatogram
11. Inferogram
12. Mass spectrum
13. Adsorption isotherm

The answer is C. Mass spectrum

10. One of these is not a neutral molecule
11. C₂H₄
12. NH₃
13. CO₂
14. C₂H₂

The answer is C. CO₂