This question is about isomers:
Give a reagent and observations for a test-tube reaction to distinguish between 2-methylbutan-1-ol and 2-methylbutan-2-ol - AQA - A-Level Chemistry - Question 6 - 2019 - Paper 2
Question 6
This question is about isomers:
Give a reagent and observations for a test-tube reaction to distinguish between 2-methylbutan-1-ol and 2-methylbutan-2-ol.
Reagent:... show full transcript
Worked Solution & Example Answer:This question is about isomers:
Give a reagent and observations for a test-tube reaction to distinguish between 2-methylbutan-1-ol and 2-methylbutan-2-ol - AQA - A-Level Chemistry - Question 6 - 2019 - Paper 2
Step 1
Reagent
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Answer
To distinguish between 2-methylbutan-1-ol and 2-methylbutan-2-ol, the reagent used can be acidified potassium dichromate (K2Cr2O7) or similar chromate ions.
Step 2
Observation with 2-methylbutan-1-ol
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Answer
When 2-methylbutan-1-ol is treated with the reagent, it is oxidized and a color change from orange to green is observed.
Step 3
Observation with 2-methylbutan-2-ol
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Answer
In contrast, when 2-methylbutan-2-ol is tested, there is no significant observable change, and the solution remains orange.
Step 4
Draw a structure for A and B
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Answer
A:
CH3
|
CH3-C-CH2-CH3
|
OH
B:
CH3
|
CH3-C-CH2-CH3
|
CH3
Step 5
Draw a structure for C and D
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Answer
C:
Br
|
Br-C-C-C
| |
CH CH,
| |
CH
D:
Br
|
Br-C-C-C
| |
CH2 CH
|
CH
Step 6
Label each spectrum
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