Qualitative Tests of Carbohydrates

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What color product is formed in Seliwanoff's Test when ketohexoses react with resorcinol?

Yellow

Cherry red (correct)

Blue

Green

What reagent is used in Bial's Test as a dehydrating acid?

Orcinol

Bial's reagent

Concentrated HCl (correct)

Ferric chloride

What is the purpose of Seliwanoff's Test?

To distinguish between pentose monosaccharide and hexose monosaccharide

To test for the presence of furfural in solutions

To differentiate between glucose and fructose

To distinguish between aldoses and ketoses (correct)

Which compound reacts with orcinol and iron ion in Bial's Test to produce a bluish or green product?

Furfural Signup and view all the answers

What does Barfoed's reagent consist of?

Cupric acetate and acetic acid Signup and view all the answers

In which test are aldohexoses known to give a yellow to faint pink color?

Seliwanoff's Test Signup and view all the answers

Which test uses 6M HCl as a dehydrating agent?

Seliwanoff's Test Signup and view all the answers

What do hexoses yield in Bial's Test with the presence of iron ion?

[FeCl3] and orcinol Signup and view all the answers

What is the purpose of the addition of more water if the color is not obvious during a test?

To enhance color development by changing pH Signup and view all the answers

What is the role of ferric chloride in Bial’s Test?

Condensation reagent Signup and view all the answers

Qualitative Tests of Carbohydrates

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Questions and Answers

What color product is formed in Seliwanoff's Test when ketohexoses react with resorcinol?

What reagent is used in Bial's Test as a dehydrating acid?

What is the purpose of Seliwanoff's Test?

Which compound reacts with orcinol and iron ion in Bial's Test to produce a bluish or green product?

What does Barfoed's reagent consist of?

In which test are aldohexoses known to give a yellow to faint pink color?

Which test uses 6M HCl as a dehydrating agent?

What do hexoses yield in Bial's Test with the presence of iron ion?

What is the purpose of the addition of more water if the color is not obvious during a test?

What is the role of ferric chloride in Bial’s Test?

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