Topic questions Chemical analysis Infrared spectroscopy
8 questions · 24 marks · about 30 minutes
Which process does not involve infrared radiation?
A Catalytic ozone depletion
B Monitoring toxic gases in the air
C Measuring ethanol in breathalyser tests
D Global warming
Also involves E-Z isomerism
This question is about spectral analysis.
Compound K, C4H10O, is refluxed with H2SO4 to form a mixture of compound L and compound M.
The infrared spectrum of compound K is shown.
Compound L and compound M are analysed using13C NMR spectroscopy.
• The13C NMR spectrum of compound L has 4 peaks.
• The13C NMR spectrum of compound M has 2 peaks.
Suggest the functional group in compound K, showing your reasoning, and suggest possible structures for compound K, compound L and compound M.
Functional group........
* An unknown organic compound N is analysed and produces the following results.
Elemental analysis by mass
C, 62.07%; H, 10.34%; O, 27.59%
Mass spectrum
The numbers by the peaks are the relative peak areas.
Determine the structure of the compound N, showing all your reasoning.
Which compound could have produced the IR spectrum shown below?
A HOCH2CHO
B CH3CH2COOH
C CH3CH2COOCH3
D (CH3)2C(OH)COOH
The infrared spectrum of an organic compound is shown below.
Which compound could have produced this spectrum?
The infrared spectrum of an organic compound is shown below.
Which compound could have produced this spectrum?
A H2C=CHCH2CH2OH
B CH3COOCH2CH3
C H2NCH2COOCH3
D (CH3)2CHCONH2
Which compound could have produced the IR spectrum below?
A (CH3)2CHCHO
B (CH3)2CHCOOH
C CH3CH(OH)CH=CH2
D CH3COCH(OH)CH3
Cyclopentanol can be reacted to form cyclopentene. Cyclopentene is a liquid with a boiling point of 44 °C and a density of 0.74 g cm−3.
A student plans to prepare 4.00 g of cyclopentene by reacting cyclopentanol (boiling point 140 °C) with an acid catalyst.
The expected percentage yield of cyclopentene is 64.0%.
Method The student carries out the preparation using apparatus set up for distillation, as shown below.
1 The reaction mixture is heated gently, and a distillate containing impure cyclopentene is collected.
2 The distillate has an aqueous layer and an organic layer. The student purifies the cyclopentene from the distillate.
* Calculate the mass of cyclopentanol that the student should use and explain how pure
cyclopentene could be obtained from the distillate.
Memes
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