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    http://filestore.aqa.org.uk/subjects...W-QP-JAN10.PDF

    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?
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    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.
 
 
 
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