Which statement is correct about both 2-methylbutan-1-ol and 2-methylbutan-2-ol?
A They can be formed by alkaline hydrolysis of esters - AQA - A-Level Chemistry - Question 11 - 2018 - Paper 3
Question 11
Which statement is correct about both 2-methylbutan-1-ol and 2-methylbutan-2-ol?
A They can be formed by alkaline hydrolysis of esters.
B They can be oxidised by... show full transcript
Worked Solution & Example Answer:Which statement is correct about both 2-methylbutan-1-ol and 2-methylbutan-2-ol?
A They can be formed by alkaline hydrolysis of esters - AQA - A-Level Chemistry - Question 11 - 2018 - Paper 3
Step 1
A They can be formed by alkaline hydrolysis of esters.
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Answer
This statement is incorrect. Alkaline hydrolysis of esters produces alcohols, but not specifically 2-methylbutan-1-ol or 2-methylbutan-2-ol unless a specific ester is used.
Step 2
B They can be oxidised by reaction with acidified potassium dichromate(V).
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This is not correct for both compounds. 2-methylbutan-1-ol (a primary alcohol) can be oxidised to form an aldehyde and subsequently a carboxylic acid. However, 2-methylbutan-2-ol (a secondary alcohol) can be oxidised to a ketone, making this statement misleading.
Step 3
C They can be formed by hydration of 2-methylbut-2-ene.
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Answer
This statement is correct. Both alcohols can indeed be synthesized through the hydration of 2-methylbut-2-ene, where 2-methylbutan-1-ol can be formed via Markovnikov's rule.
Step 4
D They have four peaks in their 13C NMR spectra.
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This statement is also correct as both compounds each exhibit distinct chemical environments for their carbon atoms, leading to four peaks in their 13C NMR spectra.
