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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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Fructose reduces Tollen's reagent due to

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

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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.

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.

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
    • AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
    1. (A) Fructose has ketone group and does not reduce Tollen's reagent. ...

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    2. (A) All carbohydrates fit in the general formula Cx(H2O)y where x=y ...

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    3. (A) Glucose shows mutarotation (R) Glucose is in pyranose form and h...

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    4. (A) Sucrose is not a reducing sugar. (R) In sucrose, glucose is in p...

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    5. (A) When alpha-D glucose dissolved in water, specific rotation of the ...

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    6. (A) Fructose is the sweetest naturally occuring sugar. (R) Fructose...

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    7. (A) Cellulose is not digested by human beings. (R) Human beings are ...

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    8. (A) Hydrolysis of sucrose is called inversion of cane sugar. (R) Sucr...

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    9. (A) In a sucrose molecule, glucose is present in the furanose form and...

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    10. (A) Reducing sugars undergo mutarotion. (R) During mutarotation, one...

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    11. (A) Galactose is the C4 epimer of glucose. (R) Glucose and galacto...

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    12. (A) Sucrose is an example of reducing sugar. (R) Sucrose gives silve...

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    13. (A) Two different hexoses may give the same osazone. (R) Different H...

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    14. (A) alpha-D (+) Glucose and beta-D(+) - Glucose are enantiomers. (R)...

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    15. (A) Reduction of glucose with sodium borohydride gives sorbitol. (R)...

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    16. (A) Glucose and fructose give the same osazone. (R) Glucose and fruc...

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    17. (A): Fructose gives positive Tollen's test. (R) : Fructose is a Keto...

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    18. (A) Cane sugar undergoes inversion in aqueous solution. (R) Cane sug...

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    19. (A) C6 H(10) O5 is a carbohydrates. (R) Most of the carbohydrates ha...

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    20. (A) Lactose is a reducing sugar. (R) Lactose contains glucose and ga...

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