Which reagent could be used to carry out the following reaction?
A a solution containing acidified dichromate(VI) ions
B a solution containing dilute, acidified manganate(VII) ions
C a solution containing hot, concentrated, acidified manganate(VII) ions
D concentrated sulfuric acid
- CIE - A-Level Chemistry - Question 28 - 2018 - Paper 1
Question 28
Which reagent could be used to carry out the following reaction?
A a solution containing acidified dichromate(VI) ions
B a solution containing dilute, acidified man... show full transcript
Worked Solution & Example Answer:Which reagent could be used to carry out the following reaction?
A a solution containing acidified dichromate(VI) ions
B a solution containing dilute, acidified manganate(VII) ions
C a solution containing hot, concentrated, acidified manganate(VII) ions
D concentrated sulfuric acid
- CIE - A-Level Chemistry - Question 28 - 2018 - Paper 1
Step 1
A solution containing acidified dichromate(VI) ions
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Answer
Acidified dichromate(VI) ions are strong oxidizing agents and are typically used to oxidize primary alcohols to carboxylic acids. This reagent would not be suitable for this reaction as it suggests that an alcohol is being formed.
Step 2
B a solution containing dilute, acidified manganate(VII) ions
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Answer
Dilute, acidified manganate(VII) ions are used to oxidize primary alcohols to aldehydes, but the conditions are not severe enough to form the corresponding product in the equation given.
Step 3
C a solution containing hot, concentrated, acidified manganate(VII) ions
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Answer
Hot, concentrated, acidified manganate(VII) ions act as strong oxidizers, typically enabling the conversion of alcohols to ketones or aldehydes. This is the most suitable reagent for the given reaction.
Step 4
D concentrated sulfuric acid
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Answer
Concentrated sulfuric acid is a dehydrating agent and could promote elimination or dehydration reactions, but it would not facilitate the desired oxidation reaction that produces an alcohol.
