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Topic: Are glucose and galactose structural isomers?  (Read 13135 times)

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Offline Sophia7X

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Are glucose and galactose structural isomers?
« on: October 04, 2012, 07:42:48 PM »
My bio teacher said they were structural isomers but I thought they were stereoisomers? I tried googling this but found conflicting answers. Are stereoisomers a type of structural isomers? I thought they weren't.
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Offline AWK

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Re: Are glucose and galactose structural isomers?
« Reply #1 on: October 05, 2012, 12:57:44 AM »
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Offline Dan

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Re: Are glucose and galactose structural isomers?
« Reply #2 on: October 05, 2012, 03:11:36 AM »
Quote from: Sophia7X on October 04, 2012, 07:42:48 PM
My bio teacher said they were structural isomers but I thought they were stereoisomers? I tried googling this but found conflicting answers. Are stereoisomers a type of structural isomers? I thought they weren't.

Glucose and galactose are most definitely stereoisomers, and no, stereoisomers are not a type of structural isomer. You are correct, you teacher is wrong.
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Offline Sophia7X

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Re: Are glucose and galactose structural isomers?
« Reply #3 on: October 05, 2012, 06:08:09 AM »
So is it okay to say that glucose and galactose have the same basic structure, the only difference is that the OH groups are orientated differently in 3-D space?
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Offline Dan

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Re: Are glucose and galactose structural isomers?
« Reply #4 on: October 05, 2012, 06:20:43 AM »
Yes, key is that the atom connectivity is the same and they only differ by their 3D orientation. Structural isomers have different atom connectivity, e.g. glucose and fructose are structural isomers.
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Offline Paul2lyfe

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Re: Are glucose and galactose structural isomers?
« Reply #5 on: October 07, 2012, 10:13:43 AM »
Glucose and galactose are stereoisomers specifically called Diastereomers.
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