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(A) Galactose is the C4 epimer of gluco...

(A) Galactose is the `C_4` epimer of glucose.
(R) Glucose and galactose differ in configura- tion at `C_4`.

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:
A
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D- glucose and L - glucose differ in

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

(A) D-Glucose and D-Mannose form identical osazone on reaction with excess of phenyl hydrazine (R) D-Glucose and D-Mannose are epimers differing in configuration at C-2 only.

Mutarotation is the change in specific rotation of an optically active compound in solution with time to an equilibrium value. Interconversion is possible only if sugar has anomeric hydroxyl group i.e., sugar is reducing. Diastereomers which differ in configuration of chiral carbon developed in hemiacetal formation are called anomers. Epimers are a pair of stereoisomers which differ in the configuration about one of its chiral carbon alpha- glucose and beta- glucose differ in configuration at ______ and are called

Match the following {:("List -I", , "List -II" ),( (A) "Epimers " , , (i) "Glucose "),((B)"Anomers " , , (2) "Fructose" ), ((C) "Aldohexose", , (3) "Glucose and mannose" ),((D) "Laevulose" , ,(4) alpha -and beta " forms of glucose") , ( -, , (5) "Glucose and fructose"):} The correct match is

Mutarotation is the change in specific rotation of an optically active compound in solution with time to an equilibrium value. Interconversion is possible only if sugar has anomeric hydroxyl group i.e., sugar is reducing. Diastereomers which differ in configuration of chiral carbon developed in hemiacetal formation are called anomers. Epimers are a pair of stereoisomers which differ in the configuration about one of its chiral carbon On which carbon atom glucose and galactose differ in the position of -H and -OH groups?

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

(A) Fructose is the sweetest naturally occuring sugar. (R) Fructose is a functional isomer of glucose.

(A): Lactose on hydrolysis gives glucose and gallactose. (R): Lactose is an example of disaccharide.

AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. (A) In a sucrose molecule, glucose is present in the furanose form and...

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

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

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

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

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

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

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

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

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

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

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

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

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  14. (A) D-Glucose and D-Mannose form identical osazone on reaction with ex...

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  15. (A) Sucrose is reducing sugar where as maltose is non-reducing sugar. ...

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  16. (A) Glucose gives a reddish-brown ppt with Fehling's solution. (R) R...

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  17. (A) Sucrose is a non-reducing carbohydrate. (R) In sucrose both the ...

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  18. (A) Glycogen is known as animal starch. (R) The structure of glycoge...

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  19. (A) Acetic acid fit into Cx(H2O)y gneral formula of carbohydrates. ...

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  20. (A) Honey has been used for a long time as an instant source of energy...

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