The reaction sequence shows how CH₃CH₃ can be converted into BrCH₂CH₂Br - AQA - A-Level Chemistry - Question 14 - 2017 - Paper 3
Question 14
The reaction sequence shows how CH₃CH₃ can be converted into BrCH₂CH₂Br.
CH₃CH₃ + Cl₂ → CH₃CH₂Cl Step A
NaOH → CH₃CH₂OH Step B
Br₂ → CH₂ = CH₂ Step C
Br... show full transcript
Worked Solution & Example Answer:The reaction sequence shows how CH₃CH₃ can be converted into BrCH₂CH₂Br - AQA - A-Level Chemistry - Question 14 - 2017 - Paper 3
Step 1
Step A
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Answer
Step A involves the chlorination of ethane (CH₃CH₃) using chlorine (Cl₂). This is a radical substitution reaction where chlorine radicals substitute a hydrogen atom to form chloroethane (CH₃CH₂Cl). However, this step is not a nucleophilic substitution.
Step 2
Step B
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In Step B, sodium hydroxide (NaOH) reacts with chloroethane (CH₃CH₂Cl) to form ethanol (CH₃CH₂OH). This step is a nucleophilic substitution reaction where the hydroxide ion (OH⁻) from NaOH acts as the nucleophile that attacks the carbon bonded to chlorine, leading to the substitution of the chlorine atom.
Step 3
Step C
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Step C involves the reaction of Br₂ with the product from Step B, likely leading to elimination rather than substitution. Therefore, this step does not involve nucleophilic substitution.
Step 4
Step D
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Step D references the conversion of BrCH₂CH₂Br into the next product. This step does not directly relate to nucleophilic substitution but may involve further reactions not detailed in the prompt.
