Aldoses vs ketoses?? help pls :(?

Hi everyone!! i’m just having a little trouble understanding the difference between aldoses and ketoses. There are also aldehyde and ketones (are those the same as aldoses and ketoses?) In the photo... B is part of the carbonyl group and the answer is ketoses, however how is it ketoses? I know that ketoses are in the middle of carbon chains and aldehydes are at the end but how is it that in the example B the double bonded oxygen is in the middle? i’ve tried to find pictures similar to these but i couldn’t find any on google. thanks in advance  

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  • 4 weeks ago

    Aldoses are monosaccharides that contain an aldehyde group per molecule. Ketoses are monosaccharides that contain a ketone group per molecule. 

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