AQA CHEM4 and CHEM5 revision thread 2016

Reducing agent H2/Ni- to protonate the inner ring

CH2

goes from 120 to 109.5

A trimer is a polymer with only 3 monomers in it, the answer to this question is basically the product formed in step 3 but with an extra monomer of ethanal added.
so it should look like this i think:

Reducing agent H2/Ni- to protonate the inner ring

CH2

goes from 120 to 109.5

How did you get ch2 as the ef i dont get it - i did the pp last nyt i got c3h6 as the usuall molcular formula is c6h12

The empirical formula is the simplest whole number ratio in whichthe atoms of each element in a compound are found.

The formula of cyclohexane is C6H12. Dividing each number of atoms by the smallest number (6) gives us CH2 as the empirical formula. CH2 cannot be further simplified to a whole number ratio and so is the simplest whole number ratio.

I usually / by 2 to get the simplest ratio until you cant half anymore to get a simple number - just curios why it didnt work here

I usually / by 2 to get the simplest ratio until you cant half anymore to get a simple number - just curios why it didnt work here

the mark scheme called the ester (1)-methylethyl ethanoate, however i didn't put the(1) as i didn't think it was needed as the methyl group couldn't come off anywhere else, would i get the mark?

If the one was in brackets then I think you can still get the mark


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thank you! i thought so

How did you get ch2 as the ef i dont get it - i did the pp last nyt i got c3h6 as the usuall molcular formula is c6h12

Please could you explain why there is another -OH group in the trimer? As far as I see it the molecule X is an aldehyde with a hydroxyl group and ethanal is being added to it so there should be only one OH?

(i) Outline a mechanism for the dehydration of butan-2-ol into but-l-ene.
this for example^. its not in the book is it?

Is this elimination?

Is this elimination?

Do they ever actually require specific temperatures and pressures when naming conditions or is "high temperature" for examples always sufficient?

Methylethyl 3-methylbutanoate