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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. CH₃CH₂Br and NaOH(aq) B. CH₃COOCH₃ and NaOH(aq) C. HCOOCH₂CH₃ and NaOH(aq) D. CH₃CHO and NaBH₄(aq)
Worked Solution & Example Answer:Which pair of reagents does not produce ethanol? A - AQA - A-Level Chemistry - Question 31 - 2022 - Paper 3
Step 1
B. CH₃COOCH₃ and NaOH(aq)
Answer
To determine which pair of reagents does not produce ethanol, we can analyze each option:
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A. CH₃CH₂Br and NaOH(aq): This reaction involves the nucleophilic substitution of bromine by hydroxide ion, resulting in the production of ethanol (CH₃CH₂OH).
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B. CH₃COOCH₃ and NaOH(aq): This reaction is an ester hydrolysis, which leads to the production of an alcohol (methanol) and an acid (acetic acid), and does not yield ethanol.
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C. HCOOCH₂CH₃ and NaOH(aq): This would lead to the formation of an alcohol and does not specifically yield ethanol.
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D. CH₃CHO and NaBH₄(aq): This is a reduction reaction where acetaldehyde is reduced to ethanol.
Thus, the correct answer is B, as it does not produce ethanol.