Questions: Give the IUPAC name for the following compound. Multiple Choice (S)-2-Hydroxypentan-4-one (S)-4-Hydroxypentan-2-one (R)-2-Hydroxypentan-4-one (R)-4-Hydroxypentan-2-one

Give the IUPAC name for the following compound. Multiple Choice (S)-2-Hydroxypentan-4-one (S)-4-Hydroxypentan-2-one (R)-2-Hydroxypentan-4-one (R)-4-Hydroxypentan-2-one
Transcript text: Give the IUPAC name for the following compound. Multiple Choice (S)-2-Hydroxypentan-4-one (S)-4-Hydroxypentan-2-one (R)-2-Hydroxypentan-4-one (R)-4-Hydroxypentan-2-one
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Solution

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Solution Steps

Step 1: Identify the parent chain.

The longest carbon chain contains five carbons, making it pentane. Since it contains a ketone, it's a pentanone.

Step 2: Number the carbons.

We number the carbons so that the ketone gets the lowest possible number. Therefore, the ketone is on carbon 2, giving us pentan-2-one.

Step 3: Name and locate the substituent.

There is a hydroxyl group on carbon 4. This gives us 4-hydroxypentan-2-one.

Step 4: Determine the stereochemistry.

The hydroxyl group is on a chiral carbon. Prioritize the groups attached to the chiral carbon (carbon 4):

  1. OH
  2. The carbon chain towards the ketone.
  3. The carbon chain towards the methyl group.
  4. Hydrogen (not shown)

The order of the groups 1-2-3 goes counterclockwise, which indicates S configuration.

Final Answer

(S)-4-Hydroxypentan-2-one

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