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

Can it be any group (e.g. CH₃)or does it have to be H?

for anyone that did the PMT predicted paper, for question 15 on the MCQ, the answer was D, i was stuck between B and D but i don’t understand why it couldn’t have been B? For context, the question was asking which statement was correct. It’s a benzene ring with an aldehyde group and a phenol. the statements are A- it contains a ketone B- it will not decolourize bromine water C- it will undergo nucleophillic substitution and D- it is able to form hydrogen bonds

Yea I used the MA

model answer? wdym

Which year has the hardest past paper?

Yea model answer it had d as the answer
I didn’t use the ms for multiple choice

Yea I used the MA

because the phenol acts as a more activating group donating electron density meaning it is more easily electrophillically attacked that essentially means bromine can react without the need of halogen carrier in the ocr textbook somewere on ketones therefore bromine disspears so the water decolourises

sorry not ketones on somewere on the benzene section near the end

sorry not ketones on somewere on the benzene section near the end

oh okay 😅 does anyone know if aldehydes or phenols can decolourise bromine i thought it was just alkenes

phenol decolourises it and also forms a white ppt

the exact pg is 446 on the textbook

perfect thank you

oh ok, but do you know why it isn’t B?