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:
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The reagent required is potassium dichromate (K2Cr2O7) in an acidic solution.
Step 2
Observation with 2-methylbutan-1-ol:
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The observation would show a color change from orange to green, indicating oxidation.
Step 3
Observation with 2-methylbutan-2-ol:
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The observation would show no visible change; the solution remains orange.
Step 4
Draw a structure for A:
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A:
CH3
|
CH3-CH-CH2-CH2-OH
|
CH3
Step 5
Draw a structure for B:
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
B:
CH3
|
CH3-CH2-C-CH3
|
OH
Step 6
Draw a structure for C:
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
C:
C
/ \
Br-C Br
| \
CH3 Br-C
| \
CH3
Step 7
Draw a structure for D:
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
D:
C
/ \
Br-C Br
| \
CH3 Br-C
\ / \
CH CH3
Step 8
Label each spectrum with the correct letter E, F or G in the box:
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
E corresponds to the spectrum showing a broad OH stretch, F and G can be identified by distinguishing features in their peak patterns.
