OCR A-level Chemistry A Paper 2 - 16th June 2025 [Exam Chat]

I got B it was 1:2 as it had 2 carboxylic acid groups so Na subbed twice to make the salt

Yeah I might be wrong idk. Do u remember what u got for mass of bromine gas question mcq?

Did anyone get a carboxylic acid for NMR?

I got an ester

How are people getting 8 stereoisomers?

I got 12.8 coz it said the starting compound was 0.02mol and it wanted it to react in a way that would make it saturated. So for that u need 2Br2 molecules and so the moles becomes 0.02 x 2 = 0.04mol as you have one mol of compound and 2 moles of bromine and then u do 0.04 x (79.9(4)) as it is br2 and u get 12.80 which is D. Idk if this is right method or not though

I got B it was 1:2 as it had 2 carboxylic acid groups so Na subbed twice to make the salt

I got 12.8 coz it said the starting compound was 0.02mol and it wanted it to react in a way that would make it saturated. So for that u need 2Br2 molecules and so the moles becomes 0.02 x 2 = 0.04mol as you have one mol of compound and 2 moles of bromine and then u do 0.04 x (79.9(4)) as it is br2 and u get 12.80 which is D. Idk if this is right method or not though

U had 2Br2 but I swear the mole number before it doesn’t count when calculating moles?

guys am i the only one who got 5.04 for the percentage yield synthesis question... idek where i went wrong🤣

Uhhh no… they do matter

Nah they meant as in u had 2Br2 and so the moles would be 2 x 0.02 = 0.04. Then u calculate the mass of Br2 which is 0.02 x (79.9 x 2) which is 6.4

ChatGPT - • The whole H–Br molecule, with a polar bond, is the initial electrophile.
• The Hδ⁺ is the part of the molecule that accepts electrons, but it only acts electrophilically because of the bond’s polarity.

So the answer was C?

So the answer was C?

It should be i mean all the others dont make sense