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(A) Sucrose is not a reducing sugar. (...

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

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

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The correct Answer is:
B
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Statement-1: Glucose is in pyranose form and has free anomeric hydroxyl group Statement-1: In sucrose, glucose is in pyranose form and fructose is in furanose form.

(A) Lactose is a reducing sugar. (R) Lactose contains glucose and galactose units.

(A) In a sucrose molecule, glucose is present in the furanose form and fructose is present in the pyranose form. (R) Pyranose and furanose are homocyclic ring compounds.

(A) Sucrose is an example of reducing sugar. (R) Sucrose gives silver mirror test with Tollens reagent.

Why sucrose is called invert sugar ?

Sucrose contains glucose and fructose linked by

(A) Sucrose is a non-reducing carbohydrate. (R) In sucrose both the monosaccharides are in acetal form.

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AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. (A) All carbohydrates fit in the general formula Cx(H2O)y where x=y ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  20. (A) Lactose is a reducing Sugar (R) Lactose if formed by glucosidic ...

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