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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The chemical reaction for the detection of carbohydrates using Molisch’s test involves the dehydration of the carbohydrate by concentrated sulfuric acid to form

A. A carboxylic acid
B. An amino sugar
C. Furfural or a furfural derivative
✓
D. A sugar alcohol like sorbitol

📝 Explanation

Concentrated H₂SO₄ dehydrates pentoses to furfural and hexoses to hydroxymethylfurfural. These compounds react with α-naphthol (in Molisch's reagent) to form a purple/violet ring. This is a general test for all carbohydrates.

📖 Additional Information

  • A carboxylic acid
  • An amino sugar
  • Furfural or a furfural derivative
  • A sugar alcohol like sorbitol

Concentrated H₂SO₄ dehydrates pentoses to furfural and hexoses to hydroxymethylfurfural. These compounds react with α-naphthol (in Molisch's reagent) to form a purple/violet ring. This is a general test for all carbohydrates.

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