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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 & R are true and R is the correct explanation of A

B

Both A & R are true, but R is not the correct explanation of A

C

A is true, R is false

D

A is false, R is true

Text Solution

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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 - 1
  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): Lactose on hydrolysis gives glucose and gallactose. (R): Lactos...

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

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  7. The peptide linkage is

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  8. Which of the following contains nitrogen ?

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  9. The building unit of all proteins are

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  10. Number of peptide linkages in the artificial sweetner ''aspartame'' is

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  11. The structural feature which distinguishes proline from alpha - amino ...

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  12. Which of the following amino acids possesses a non polar side chain

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  13. Which of the following amino acids contains a thiol group in the side ...

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  14. The amino acid which contain a hydroxy group in the side chain

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  15. Essential amino acid among the following is

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  16. The number of amino acids found in proteins that a human body can synt...

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  17. Which one of the following is not an essential anino acid?

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  18. Among the following the basic amino acid is

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  19. Which of the following statement is not correct ?

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  20. For an aminoacid 'X', the isoelectric point is 6.1. Then 'X' is

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