Spectroscopy (OCR A-Level Chemistry A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the primary purpose of mass spectrometry in organic chemistry?
What is the primary purpose of mass spectrometry in organic chemistry?
To identify compounds by molecular mass
What is a molecular ion () in mass spectrometry?
What is a molecular ion () in mass spectrometry?
A molecule that loses one electron
Where does the M⁺ peak appear on a mass spectrum?
Where does the M⁺ peak appear on a mass spectrum?
At the highest value
What causes the M+1 peak in a mass spectrum?
What causes the M+1 peak in a mass spectrum?
Presence of carbon-13 isotope
What percentage of naturally occurring carbon atoms are carbon-13?
What percentage of naturally occurring carbon atoms are carbon-13?
1.1%
M peak height is 74 mm, M+1 peak is 4.5 mm. How many carbon atoms are present?
M peak height is 74 mm, M+1 peak is 4.5 mm. How many carbon atoms are present?
6
In fragmentation, what species are detected by the mass spectrometer?
In fragmentation, what species are detected by the mass spectrometer?
Only positively charged fragment ions
Why do isomers produce different mass spectra despite having the same molecular mass?
Why do isomers produce different mass spectra despite having the same molecular mass?
They have different fragmentation patterns
What is the value for the fragment ion ?
What is the value for the fragment ion ?
29
By how many mass units do successive alkyl cation fragments increase?
By how many mass units do successive alkyl cation fragments increase?
14 (one group)