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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?

Purple or purplish-red Signup and view all the answers

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

$\text{H}_2\text{SO}_4$ Signup and view all the answers

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

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

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

Presence of polar hydroxyl groups 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?

Structural and chemical resemblance between carbohydrates Signup and view all the answers

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

Conduct the tests with individual sugars rather than mixtures 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?

To simplify and expedite the identification process Signup and view all the answers

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

Group test for carbohydrates Signup and view all the answers

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

0.1-1 percent Signup and view all the answers

Qualitative Analysis of Carbohydrates

Choose a study mode

Podcast

Questions and Answers

What is the purpose of Molisch's test?

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

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

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

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

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

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

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

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

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

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

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

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Qualitative Analysis of Carbohydrates

Qualitative Analysis of Carbohydrates

Qualitative Analysis of Carbohydrates

Qualitative Analysis of Carbohydrates

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