Aldose vs. Ketose 5

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it does go with the carbon structure, because you look at where the C=O is on the carbon chain.

Last updated 4:32 PM on 8/11/26
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7 Terms

1
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Aldose

A sugar with an aldehyde group.
Easy clue: C=O at the end.

The O stands for oxygen. ✅

So in C=O:

  • C = carbon

  • O = oxygen

  • = means a double bond

So C=O = carbon double-bonded to oxygen.

<p></p><p>A sugar with an <strong>aldehyde group</strong>.<br><strong>Easy clue:</strong> <strong>C=O at the end</strong>.</p><p>The <strong>O stands for oxygen</strong>. <span data-name="check_mark_button" data-type="emoji">✅</span></p><p>So in <strong>C=O</strong>:</p><ul><li><p><strong>C = carbon</strong></p></li><li><p><strong>O = oxygen</strong></p></li><li><p><strong>=</strong> means a <strong>double bond</strong></p></li></ul><p>So <strong>C=O = carbon double-bonded to oxygen</strong>.</p>
2
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Ketose

A sugar with a ketone group.
Easy clue: C=O in the middle/inside.

The O stands for oxygen. ✅

So in C=O:

  • C = carbon

  • O = oxygen

  • = means a double bond

So C=O = carbon double-bonded to oxygen.

<p>A sugar with a <strong>ketone group</strong>.<br><strong>Easy clue:</strong> <strong>C=O in the middle/inside</strong>.</p><p>The <strong>O stands for oxygen</strong>. <span data-name="check_mark_button" data-type="emoji">✅</span></p><p>So in <strong>C=O</strong>:</p><ul><li><p><strong>C = carbon</strong></p></li><li><p><strong>O = oxygen</strong></p></li><li><p><strong>=</strong> means a <strong>double bond</strong></p></li></ul><p>So <strong>C=O = carbon double-bonded to oxygen</strong>.</p>
3
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Glucose

Common aldose sugar.

4
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Fructose

Common ketose sugar.

5
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How do I tell aldose vs. ketose?

Find the C=O.

6
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C=O at the end

Aldose ✅

7
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C=O inside the chain

Ketose ✅