Which pair of reagents does not produce ethanol?
A - AQA - A-Level Chemistry - Question 31 - 2022 - Paper 3
Question 31
Which pair of reagents does not produce ethanol?
A. CH$_3$CH$._2$Br and NaOH(aq)
B. CH$_3$COOCH$_2$ and NaOH(aq)
C. HCOOCH$_2$CH$._3$ and NaOH(aq)
D. CH$_3$CHO a... show full transcript
Worked Solution & Example Answer:Which pair of reagents does not produce ethanol?
A - AQA - A-Level Chemistry - Question 31 - 2022 - Paper 3
Step 1
Identify the Reagents
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Answer
We have four pairs of reagents, as follows:
A: CH3CH2Br and NaOH(aq)
B: CH3COOCH2 and NaOH(aq)
C: HCOOCH2CH3 and NaOH(aq)
D: CH3CHO and NaBH4(aq)
Step 2
Analyze Each Option
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Answer
We need to determine which pair does not result in the production of ethanol:
Option A: CH3CH2Br reacts with NaOH(aq) to form ethanol through nucleophilic substitution.
Option B: CH3COOCH2 (an ester) reacts with NaOH(aq), undergoing hydrolysis, which can produce ethanol.
Option C: HCOOCH2CH3 reacts similarly with NaOH(aq) to yield ethanol through hydrolysis.
Option D: CH3CHO (acetaldehyde) reacts with NaBH4(aq), but it does not produce ethanol directly.
Step 3
Conclusion
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Answer
The pair that does not produce ethanol is B: CH3COOCH2 and NaOH(aq).
