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Which alcohol will react with an acidified solution of potassium dichromate(VI) to produce a ketone containing six carbon atoms? A 2,2-dimethylbutan-1-ol B 2-methylpentan-3-ol C 3,3-dimethylpentan-2-ol D 3-methylpentan-3-ol - CIE - A-Level Chemistry - Question 26 - 2018 - Paper 1
Question 26
Which alcohol will react with an acidified solution of potassium dichromate(VI) to produce a ketone containing six carbon atoms? A 2,2-dimethylbutan-1-ol B 2-meth... show full transcript
Worked Solution & Example Answer:Which alcohol will react with an acidified solution of potassium dichromate(VI) to produce a ketone containing six carbon atoms? A 2,2-dimethylbutan-1-ol B 2-methylpentan-3-ol C 3,3-dimethylpentan-2-ol D 3-methylpentan-3-ol - CIE - A-Level Chemistry - Question 26 - 2018 - Paper 1
Step 1
Which alcohol will react with an acidified solution of potassium dichromate(VI) to produce a ketone containing six carbon atoms?
Answer
To determine which alcohol reacts to form a ketone with six carbons, we first recognize that potassium dichromate (VI) can oxidize secondary alcohols to ketones.
Let's analyze each option:
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A: 2,2-dimethylbutan-1-ol
- This is a tertiary alcohol and will not be oxidized to a ketone.
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B: 2-methylpentan-3-ol
- This is a secondary alcohol. Upon oxidation, it can yield 2-methylpentan-2-one, which has six carbon atoms.
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C: 3,3-dimethylpentan-2-ol
- Also a tertiary alcohol and will not be oxidized to a ketone.
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D: 3-methylpentan-3-ol
- This is a tertiary alcohol as well and will not be oxidized to a ketone.
From this analysis, the correct answer is B: 2-methylpentan-3-ol, as it is the only secondary alcohol listed that can be oxidized to yield a ketone with six carbon atoms.