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IAL Chemistry Unit 5 Jan 2021 Discussion (WCH15)

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?
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.
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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Avatar for ran-dumb
ran-dumb
OP
21
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.
Reply 4
Avatar for zero0000
zero0000
7
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?
Original post by zero0000
Are you sure about the combustion question?

Yes, pretty sure.

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