Single Choice

Which of the following pairs gives positive Tollens test?

AGlucose, sucrose
BGlucose, fructose
Correct Answer
CHaxanal, acetophenone
DFructose, sucrose

Solution

Glucose is an aldehyde, gives positive Tollens test. Fructose although ketne gives positive Tollens test because under the basic condition of the regent fructose undergoes a rearrangement to form glucose and mannose ($$C-2$$ epimer of glucose)

SIMILAR QUESTIONS

Biomolecules

Which of the following statements is correct ?

Biomolecules

Which of the following statement is not true for glucose?

Biomolecules

$$A, B$$ and $$C$$ are three biomolecules. The results of the tests performed on them are given below : Molisch's Test Barfoed Test Biuret Test $$A$$ Positive Negative Negative $$B$$ Positive Positive Negative $$C$$ Negative Negative Positive $$A, B$$ and $$C$$ are respectively :

Biomolecules

Fructose and glucose can be distinguished by:

Biomolecules

What will happen when $$D-(+)-$$ glucose is treated with methanolic $$-HCl$$ followed by Tollens' reagent?

Biomolecules

Fructose reduces Tollen's reagent due to:

Biomolecules

Fructose reduces Tollen's reagent due to:

Biomolecules

Which of the following pairs give positive Tollen's test?

Biomolecules

A certain compound gives negative test with ninhydrin and positive test with Benedict's solution. The compound is:

Biomolecules

How many moles of $$(C)$$ react with $$1\ mol\ PhNHNH_2$$

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