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    I understand why its not C or D because they are aldehdyes which can be further oxidised to carboxylic acids. But I dont understand why B cannot be oxidised but A can when it is also a ketone which cant be oxidies any further.Attachment 586534586536
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    Try drawing the structure out in full.
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    I did
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    A has a secondary alcohol group.
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    (Original post by Ann_Onymous)
    I understand why its not C or D because they are aldehdyes which can be further oxidised to carboxylic acids. But I dont understand why B cannot be oxidised but A can when it is also a ketone which cant be oxidies any further.Attachment 586534586536
    You're correct in that A and B both have ketones and these won't be further oxidised, but each also has an alcohol group, think about which of these can be oxidised, drawing the product should definitely help
 
 
 
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