11 markeasy
The infrared spectrum of an organic compound is shown.
Which of these compounds would give this infrared spectrum?
Choose your answer
hexanal
hexane
hexanoic acid
hexan-1-ol
Chemistry
Organic Chemistry: Techniques & Spectra — Multiple-Choice Questions (Edexcel IAL Chemistry): Exam Questions
Exam code:YCH119 questions · 11 marks · ≈ 11 min
21 markeasy
In a mass spectrum, the molecular ion is the ion which always has the
Choose your answer
greatest abundance
greatest stability
highest charge
highest mass/charge ratio
31 markeasy
Butan-1-ol and butan-2-ol are isomers.
Which m / z value would be expected to have a significant peak in the mass spectrum of butan-1-ol but not that of butan-2-ol?
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15
29
43
57
41 markeasy
Which could be the infrared spectrum of CH2=CHCH2OH?
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51 markeasy
An aliphatic organic compound has the infrared spectrum shown.
What are the bond stretches responsible for the peaks P and Q in the spectrum?
| P | Q | ||
|---|---|---|---|
| □ | A | O—H carboxylic acid | C═O carboxylic acid |
| □ | B | O—H carboxylic acid | C═O aldehyde |
| □ | C | C—H aldehyde | C═O carboxylic acid |
| □ | D | C—H aldehyde | C═O aldehyde |
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61 markmedium
The infrared spectrum of a compound X is shown.
Which could be compound X?
Choose your answer
71 markmedium
The mass spectrum of propanone is shown.
Which fragment is most likely to produce the peak at *m / z *= 43?
Choose your answer
CH3CH2C
CH3CO+
CH2CHO+
CHCH2O+
81 markmedium
Which reagent produces a silver mirror when warmed with propanal but not when warmed with propanone?
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2,4-dinitrophenylhydrazine (Brady's reagent)
Acidified potassium dichromate(VI)
Fehling's solution
Tollens' reagent
93 markshard
A colourless liquid, Z, is known to be either ethanol (CH3CH2OH) or methoxymethane (CH3OCH3).
The mass spectrum and infrared spectrum of Z are shown.
What is the relative molecular mass, Mr, of compound Z?
Choose your answer
30
44
46
60
The broad IR absorption in the range 3230–3550 cm–1 is characteristic of which bond?
Choose your answer
C=C
C=O
C–H
O–H (alcohol)
What is the identity of compound Z?
Choose your answer
Ethanol, because the IR shows a broad peak at 3200–3550 cm–1
Ethanol, because the IR shows no peak near 1715 cm–1
Methoxymethane, because both compounds have Mr = 46
Methoxymethane, because methoxymethane contains an O–H bond