Which alcohol is not likely to have a fragment ion at m/z = 43 in its mass spectrum?
CH3CH2CH(OH)CH3
CH3CH2CH2CH2OH
CH3CH(OH)CH2CH2CH3
(CH3)2CHCH2OH
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Which alcohol is not likely to have a fragment ion at m/z = 43 in its mass spectrum?
CH3CH2CH(OH)CH3
CH3CH2CH2CH2OH
CH3CH(OH)CH2CH2CH3
(CH3)2CHCH2OH
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Which organic functional group could have produced the infrared spectrum below?
An aldehyde
An alcohol
A carboxylic acid
A ketone
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Which group of compounds could not be differentiated from each other using ONLY infrared spectroscopy?
Propane, propan-1-ol, propan-2-one, propanoic acid.
Propane, propanoic acid, propan-1-ol, propanal
Propane, propan-2-ol, propan-2-one, propanoic acid
Propanoic acid, propanal, propan-2-one, propane
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Which compound could show a small M+1 peak at m/z = 73?
Pent-1,3-diene
Pentane
Cyclopentane
Butan-2-ol
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Which compound could have produced the infrared spectrum below?
Butanal
Butanoic acid
Butan-1-ol
But-1-ene
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An unknown organic compound produced the infrared spectrum below.
Which conclusion(s) is / are correct about the unknown organic compound?
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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Butanal, CH3CH2CH2CHO, and butanone, CH3CH2COCH3, are carbonyl compounds.
When these compounds are compared using analytical methods, which of the following statements is not correct?
The compounds produce different patterns in the fingerprint region of the IR spectrum
The carbonyl groups absorb at frequencies in the same region of the IR spectrum
The compounds have molecular ion peaks at different mass to charge ratios in a mass spectrum
The compounds produce different fragmentation patterns in a mass spectrum
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Which statement(s) is / are possible uses and applications of infrared spectroscopy?
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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Which alcohol is not likely to have a fragment ion at m/z = 29 in its mass spectrum
CH3CH2CH2OH
CH3CH(OH)CH2CH3
(CH3)2CH(OH)
CH3CH2CH(OH)CH2CH3
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Bromine exists as two isotopes 79Br and 81Br, which are found in almost equal abundance.
Which of the following statements is correct?
79Br is more reactive than 81Br
The mass spectrum of C3H7Br has two molecular ion peaks at 122 and 124
The atomic radius of 79Br is less than the atomic radius of 81Br
The first ionisation energy of 79Br is less than the first ionisation energy of 81Br
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Which ketone is likely to have fragment ions at m/z = 15 and m/z = 43 but not at m/z = 29 in its mass spectrum?
Pentan-3-one
3-methylbutanone
Hexan-3-one
Butanone
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A compound has the composition by mass:
C, 52.2%; H, 13.0%; O, 34.8%
Which compound has this composition?
CH3CHO
CH3COOH
HCOOCH3
C2H5OH
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Which pair of compounds would you expect to both have a singly charged peak at m/z = 29 in the mass spectrum?
Propanal and propanone
Propan-1-ol and propanal
Propan-2-ol and propanal
Propanone and propan-2-ol
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Which compound could produce the IR spectrum below?
CH3COOH
CH3CONH2
CH3CH2OH
CH3CHOHCN
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An alcohol A is heated under reflux with sulfuric acid and potassium dichromate(VI).
The organic compound formed produces the infrared spectrum below.
Which compound could be alcohol A?
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Analysis of an unknown organic compound yields the following information.
What is the identity of the unknown organic compound?
3-hydroxypropanoic acid
3-hydroxypropanal
1-hydroxypropanone
2-oxopropanoic acid
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Which of the following statements is/are correct?
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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Which statement about propanal, prop-2-en-1-ol and butane is not correct?
Mass spectroscopy can be used to distinguish between propanal and prop-2-en-1-ol.
One molecule will show a peak at m / z = 43 on a mass spectrum.
The fingerprint region on an infrared spectrum alone is enough to identify a molecule.
The order of increasing boiling points is butane, propanal, prop-2-en-1-ol.
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Multiple analytical techniques were carried out on molecule X with the following results.
Butanoic acid
2-hydroxybutanal
4-hydroxybutanal
3-hydroxybutan-2-one
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