Qualitative Analysis of Carbohydrates
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Questions and Answers

What is the purpose of Molisch's test?

  • To check for the presence of carbohydrates in a given analyte (correct)
  • To check for the presence of proteins in a given analyte
  • To check for the presence of lipids in a given analyte
  • To check for the presence of nucleic acids in a given analyte

    • What is the name of the reagent used in Molisch's test?

  • Fehling's solution
  • Molisch's reagent (correct)
  • Tollen's reagent
  • Benedict's reagent

    • Which carbohydrates do NOT give a positive result in Molisch's test?

  • Tetroses & trioses (correct)
  • Disaccharides & monosaccharides
  • Polysaccharides & glycoproteins
  • Pentoses & hexoses

    • What color change confirms a positive reaction in Molisch's test?

    <p>Purple or purplish-red</p> Signup and view all the answers

    In Molisch's test, what catalyzes the dehydration of sugars to form furfural or hydroxymethyl furfural?

    <p>$\text{H}_2\text{SO}_4$</p> Signup and view all the answers

    What is the basis for the positive response in Molisch's test for carbohydrates?

    <p>Dehydration of sugars to form furfural derivatives with the presence of certain reagents</p> Signup and view all the answers

    What property of monosaccharides and oligosaccharides makes them readily soluble in water?

    <p>Presence of polar hydroxyl groups</p> Signup and view all the answers

    Why are there several difficulties in the qualitative analysis of carbohydrates in a sample that contains a mixture of carbohydrates?

    <p>Structural and chemical resemblance between carbohydrates</p> Signup and view all the answers

    What recommendation is given for carrying out qualitative tests for carbohydrates in a laboratory setting?

    <p>Conduct the tests with individual sugars rather than mixtures</p> Signup and view all the answers

    Why are specific rapid tests recommended for establishing the presence or absence of sugars or carbohydrates in a sample?

    <p>To simplify and expedite the identification process</p> Signup and view all the answers

    What is the most common type of test used to detect the presence of carbohydrates in a solution?

    <p>Group test for carbohydrates</p> Signup and view all the answers

    What concentration range of sugar solutions is typically used to confirm the sensitivity of carbohydrate tests?

    <p>0.1-1 percent</p> Signup and view all the answers

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