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(A) Fructose has ketone group and does n...

(A) Fructose has ketone group and does not reduce Tollen's reagent.
(R) Fructose in Haworth structure has SiX membered ring.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

Verified by Experts

The correct Answer is:
D
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Eventhough fructose contains ketone group, it is reducing sugar, Why?

Formic acid reduces Tollen's reagent, but acetic acid does not-Give reasons.

Knowledge Check

  • Fructose reduces Tollen's reagent due to

    A
    asymmetric carbons
    B
    primary alcoholic group
    C
    secondary alcoholic group
    D
    enolisation of fructose followed by conversion to aldehyde by base

  • (A): Fructose gives positive Tollen's test. (R) : Fructose is a Ketose.

    A
    Both (A) and (R) are true and (R) is the correct explanation of (A)
    B
    Both (A) and (R) are true and (R) is not the correct explanation of (A)
    C
    (A) is true but (R) is false
    D
    Both (A) and (R) are false

  • A compound reduces Tollen's reagent but does not reduce Fehling's or Benedict solution. It is

    A
    Glucose
    B
    Benzaldehyde
    C
    Acetophenone
    D
    Acetaldehyde

    • Similar Questions

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    An organic compound contains 69.77% carbon, 11.63% hydrogen and rest oxygen. The molecular mass of the compound is 86. It does not reduce Tollens’ reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound.

    An organic compound contains 69.77\% carbon, 11.63\% hydrogen and rest oxygen. The molecular mass of the compound is 86. It doesnot reduce Tollens reagent but forms sodium hydrogensulphite adduct and gives +ve iodoform test. On vigorous oxidation forms ethanoic and propanoic acids. Write the possible structure of the compound.

    (A) Formic acid reduces Tollen's reagent. (R) Compounds containing free-CHO group reduce Tollen's reagent.

    Monosaccharides and disaccharides in which aldehyde group is free reduce Tollen's reagent as well as Fehling solution and hence are known as reducing sugars. Carbohydrates react with excess of phcayl kydrazine to yield their crystalline derivatives called oxazones. In osazone formation only the first two carbon atoms are irrelved Osazone on hydrolysis gives same which are reduction with ZnCH_(3)COOH gives a ketose sugar The same osazone is formed by

    (A) Sucrose is not a reducing sugar. (R) In sucrose, glucose is in pyranose form and fructose is in furanose form.

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