Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
    • Thread Starter


    Can someone explain how to get the 3 marks for 4b.

    The mark scheme isn't very clear.
    How do you know product Q is a racemic mixture?

    The question tells you that you cannot distinguish between the two by testing optical activity. We know that R doesn't form an optically active compound so it will show no optical activity. Therefore Q, which does form a compound with a chiral centre, must form an equal mixture of enantiomers and won't rotate polarised light.

    I'm not too sure why it forms a racemic mixture but I think it might be because the C double bond O is planar so there is an equal likelihood of attack from either side therefore forming a racemic mixture.
Submit reply
Turn on thread page Beta
Updated: June 8, 2016
Do you like carrot cake?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.