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The open chain structure of glucose has five -OH groups attached to different carbon atoms, confirmed by its reaction with acetic anhydride to form a pentaacetate.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Carbohydrates - Monosaccharides - Structure and Properties
A trihydric alcohol has three -OH groups. Glycerol (CH₂OH-CHOH-CH₂OH) is a trihydric alcohol, also known as propane-1,2,3-triol.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Preparation of Alcohols - from Alkenes Haloalkanes Carbonyls Grignard
Propane-1,2,3-triol (glycerol, CH₂OH-CHOH-CH₂OH) has three -OH groups, as indicated by ‘triol’ in its name.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
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