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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)₂COOH
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
Identify the compound that yields a ketone
Answer
To determine which compound reacts to form a ketone when warmed with an acidified solution of potassium dichromate(VI), we need to analyze each option:
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A: CH₃CH₂CH₂OH (propan-1-ol) - This is a primary alcohol, and upon oxidation, it forms an aldehyde (not a ketone).
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B: (CH₃)₂CHOH (isopropanol) - This is a secondary alcohol which, upon oxidation, can be converted into a ketone (acetone).
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C: CH₃CH₂CHO (propanal) - This is an aldehyde and will not form a ketone.
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D: (CH₃)₂COOH (acetic acid) - This is a carboxylic acid and cannot be oxidized to form a ketone.
Thus, the correct answer is B: (CH₃)₂CHOH.