Welcome to the Quiz!
This quiz contains 8 questions from a mix of 1 subtopics.
What does the number of peaks on a 13C NMR spectrum indicate?
the number of carbon atoms in the molecule
the number of magnetically distinct carbon environments in the molecule
the number of hydrogen atoms in the molecule
the number of functional groups in the molecule
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How does the bonding of a carbon atom to different atoms affect its magnetic environment?
it only affects the magnetic environment if the bonded atoms are heavier than carbon
it alters the electron density around the carbon atom, making the environments distinguishable
it only affects the magnetic environment if the bonded atoms are lighter than carbon
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In the 13C NMR spectrum of butane, CH3CH2CH2CH3, how many peaks are present?
1
4
2
3
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In the 13C NMR spectrum of chlorobutane, CH3CH2CH2CH2Cl, how many peaks are present?
4
1
2
3
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In the 13C NMR spectrum of 2,2,-dimethylpropan-1-ol, (CH3)3CCH2OH, how many peaks are present?
4
3
2
1
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What information can be obtained from chemical shift values in a 13C NMR spectrum?
insights into the functional groups attached to carbon nuclei
the exact structure of the molecule
the molecular formula of the compound
the number of carbon atoms in the molecule
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What is the purpose of matching peaks from a 13C NMR spectrum to entries in the chemical shift data table?
to determine the molecular formula of the compound
to calculate the number of hydrogen atoms in the molecule
to determine the melting point of the compound
to identify the carbon environments present in the molecule
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What information is needed, in addition to the 13C NMR spectrum, to determine the structure of an unknown molecule?
the boiling point
the density
the molecular formula
the melting point
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