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Which compound reacts to form a ketone when warmed with an acidified solution of potassium dichromate(VI)? A CH₃CH₂CH₂OH B (CH₃)₂CHOH C CH₃CH₂CHO D (CH₃)₂COOH - AQA - A-Level Chemistry - Question 25 - 2020 - Paper 3
Question 25
Which compound reacts to form a ketone when warmed with an acidified solution of potassium dichromate(VI)? A CH₃CH₂CH₂OH B (CH₃)₂CHOH C CH₃CH₂CHO D (CH₃)₂COO... show full transcript
Worked Solution & Example Answer:Which compound reacts to form a ketone when warmed with an acidified solution of potassium dichromate(VI)? A CH₃CH₂CH₂OH B (CH₃)₂CHOH C CH₃CH₂CHO D (CH₃)₂COOH - AQA - A-Level Chemistry - Question 25 - 2020 - Paper 3
Step 1
Which compound reacts to form a ketone?
Answer
To determine which of the given compounds reacts to form a ketone with an acidified solution of potassium dichromate(VI), we must recognize that potassium dichromate is an oxidizing agent that typically oxidizes alcohols to ketones or carboxylic acids.
- A CH₃CH₂CH₂OH: This is a primary alcohol (propan-1-ol), which would be oxidized to a carboxylic acid, not a ketone.
- B (CH₃)₂CHOH: This is a secondary alcohol (isopropanol), which can be oxidized to form a ketone (acetone). Hence, it is a valid option.
- C CH₃CH₂CHO: This is an aldehyde (butanal) and cannot yield a ketone during oxidation as it can be oxidized to a carboxylic acid.
- D (CH₃)₂COOH: This is a carboxylic acid (acetic acid) and does not react to form a ketone.
Conclusion: The correct answer is B (CH₃)₂CHOH, as it is the only compound among the options that reacts to form a ketone when treated with potassium dichromate(VI).