Carbon-13 NMR 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 two pieces of info does C NMR provide about a molecule?
What two pieces of info does C NMR provide about a molecule?
No. of C environments & types of C atoms
What reference compound is used for C NMR chemical shifts?
What reference compound is used for C NMR chemical shifts?
Tetramethylsilane (TMS)
What chemical shift value is assigned to TMS in C NMR?
What chemical shift value is assigned to TMS in C NMR?
ppm
What is the approximate extent of the C NMR chemical shift scale?
What is the approximate extent of the C NMR chemical shift scale?
220 ppm
In which range do carbonyl carbons (C=O) appear?
In which range do carbonyl carbons (C=O) appear?
ppm
In which range do saturated C-C bonds appear?
In which range do saturated C-C bonds appear?
ppm
When are carbon atoms considered equivalent?
When are carbon atoms considered equivalent?
When symmetrically positioned in molecule
What does the number of peaks in a C NMR spectrum equal?
What does the number of peaks in a C NMR spectrum equal?
Number of different C environments
How many peaks does propanone () show?
How many peaks does propanone () show?
2 peaks
What effect does proximity to electronegative atoms have on chemical shift?
What effect does proximity to electronegative atoms have on chemical shift?
Shifts peak to higher values