State the aldehyde portion of a glucose molecule

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What is the product in the reaction between the aldehyde portion of a glucose molecule and the c-5 hydroxyl group? The possible answers are: intramolecular hemiketal intermolecular hemiketal intramolecular hemiacetal intermolecular hemiacetal stereoisomer I'm leaning towards intramolecular hemiketal but it could also be intramolcular hemiacetal:

Reference no: EM13182787

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