IAL Chemistry Unit 5 Jan 2021 Discussion (WCH15)

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ran-dumb
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#1
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How was the paper? I don’t think there’s a thread for this one already so I’ll start.
I thought it was pretty bad, quite a bit worse than the October 2020 one (I got 74 as practice but was shocked it was full UMS). There was a 6 marker essay on catalysts there so I thought it would never come up again, but there it was again in the paper today. Good thing I remember the equations. I also had no idea about the 2 synthesis ones, usually alright at those so gutted, and the combustion question also threw me right off with the KOH. How did everyone else find it? Grade boundary predictions?
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Always blank
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#2
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For the first synthesis, use iodoform test reaction, acidify and use LiAlH4 in dry ether.
For the second synthesis, use Grignard reagent to form a tertiary alcohol and then use concentrated phosphoric acid/sulfuric acid for dehydration.
For the combustion problem, it is C4H8.
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Äries
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#3
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(Original post by Always blank)
For the first synthesis, use iodoform test reaction, acidify and use LiAlH4 in dry ether.
For the second synthesis, use Grignard reagent to form a tertiary alcohol and then use concentrated phosphoric acid/sulfuric acid for dehydration.
For the combustion problem, it is C4H8.
Failed to guess the alkene synthesis, I got a butan-1,2-diol at last.
The Contact Process problem I guessed a little bit, vanadium reduced then oxidised alternatively.
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ran-dumb
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#4
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(Original post by Äries)
Failed to guess the alkene synthesis, I got a butan-1,2-diol at last.
The Contact Process problem I guessed a little bit, vanadium reduced then oxidised alternatively.
Me too, I got to butane-2,2-diol and just said it'll somehow dehydrate to the alkene with H2SO4.
I was lucky and went over the contact process, even though I really didn't expect it after the last paper's 6 marker to be on catalysts too. I was really surprised when I saw the question.
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zero0000
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#5
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(Original post by Always blank)
For the first synthesis, use iodoform test reaction, acidify and use LiAlH4 in dry ether.
For the second synthesis, use Grignard reagent to form a tertiary alcohol and then use concentrated phosphoric acid/sulfuric acid for dehydration.
For the combustion problem, it is C4H8.
Are you sure about the combustion question?
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Always blank
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(Original post by zero0000)
Are you sure about the combustion question?
Yes, pretty sure.
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