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CHXII14:BIOMOLECULES

324614 D-glucose reacts with anhydrous methyl alcohol in the presence of dry $HCl$ gas to form :

1 2, 3, 4, 5, 6-penta -O -methyl D-glucose

2

α

-methyl D- glucopyranoside

3

β

-methyl D-glucopyranoside

4 Both (2) and (3)

CHXII14:BIOMOLECULES

324615 Assertion :
Glucose when treated with ${CH}_{3} OH$ in presence of dry $HCl$ gas gives $α$ and $β$ -methyl glucosides.
Reason :
Glucose reacts with phenyl hydrazine to form crystalline osazone.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Due to the ring structure formed by glucose, the carbon atom labeled as $(C_{1})$ becomes chiral. As a result, glucose exists in two stereoisomeric forms: $α$ -glucose and $β$ -glucose, corresponding to each stereoisomeric configuration.
Furthermore, glucose can form two distinct methyl glucosides, known as $α$ -methyl glucoside and $β$ -methyl glucoside. These different isomeric forms and derivatives are a result of the variations in the spatial arrangement of atoms around carbon atom $(C_{1})$ in the glucose molecule. So, option (2) is correct.

CHXII14:BIOMOLECULES

324616 Assertion :
Glucose gives reddish brown precipitate with Fehling solution.
Reason :
Reaction of glucose with Fehling solution gives $CuO$ and gluconic acid.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Both Assertion and Reason are correct.

Explanation:

Glucose gives reddish brown precipitate with Fehling solution consists of ${Cu}^{2 +}$ which gets reduced to ${Cu}^{+} ({Cu}_{2} O)$ , not to $CuO$ .
$\underset{Glu cose}{C_{6} H_{12} O_{6}} + 2CuO \overset{O H^{-}}{\to} C_{5} \underset{Gluconic acid}{H_{11} O_{5} COOH} + C u_{2} O$

AIIMS - 2017

CHXII14:BIOMOLECULES

324617 D-Glucose reacts with phenylhydrazine to make osazone. How many molecules of phenylhydrazine are used for this reaction per molecule of D-glucose?

1 One

2 Two

3 Three

4 Four

CHXII14:BIOMOLECULES

324614 D-glucose reacts with anhydrous methyl alcohol in the presence of dry $HCl$ gas to form :

1 2, 3, 4, 5, 6-penta -O -methyl D-glucose

2

α

-methyl D- glucopyranoside

3

β

-methyl D-glucopyranoside

4 Both (2) and (3)

CHXII14:BIOMOLECULES

324615 Assertion :
Glucose when treated with ${CH}_{3} OH$ in presence of dry $HCl$ gas gives $α$ and $β$ -methyl glucosides.
Reason :
Glucose reacts with phenyl hydrazine to form crystalline osazone.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Due to the ring structure formed by glucose, the carbon atom labeled as $(C_{1})$ becomes chiral. As a result, glucose exists in two stereoisomeric forms: $α$ -glucose and $β$ -glucose, corresponding to each stereoisomeric configuration.
Furthermore, glucose can form two distinct methyl glucosides, known as $α$ -methyl glucoside and $β$ -methyl glucoside. These different isomeric forms and derivatives are a result of the variations in the spatial arrangement of atoms around carbon atom $(C_{1})$ in the glucose molecule. So, option (2) is correct.

CHXII14:BIOMOLECULES

324616 Assertion :
Glucose gives reddish brown precipitate with Fehling solution.
Reason :
Reaction of glucose with Fehling solution gives $CuO$ and gluconic acid.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Both Assertion and Reason are correct.

Explanation:

Glucose gives reddish brown precipitate with Fehling solution consists of ${Cu}^{2 +}$ which gets reduced to ${Cu}^{+} ({Cu}_{2} O)$ , not to $CuO$ .
$\underset{Glu cose}{C_{6} H_{12} O_{6}} + 2CuO \overset{O H^{-}}{\to} C_{5} \underset{Gluconic acid}{H_{11} O_{5} COOH} + C u_{2} O$

AIIMS - 2017

CHXII14:BIOMOLECULES

324617 D-Glucose reacts with phenylhydrazine to make osazone. How many molecules of phenylhydrazine are used for this reaction per molecule of D-glucose?

1 One

2 Two

3 Three

4 Four

CHXII14:BIOMOLECULES

324614 D-glucose reacts with anhydrous methyl alcohol in the presence of dry $HCl$ gas to form :

1 2, 3, 4, 5, 6-penta -O -methyl D-glucose

2

α

-methyl D- glucopyranoside

3

β

-methyl D-glucopyranoside

4 Both (2) and (3)

CHXII14:BIOMOLECULES

324615 Assertion :
Glucose when treated with ${CH}_{3} OH$ in presence of dry $HCl$ gas gives $α$ and $β$ -methyl glucosides.
Reason :
Glucose reacts with phenyl hydrazine to form crystalline osazone.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Due to the ring structure formed by glucose, the carbon atom labeled as $(C_{1})$ becomes chiral. As a result, glucose exists in two stereoisomeric forms: $α$ -glucose and $β$ -glucose, corresponding to each stereoisomeric configuration.
Furthermore, glucose can form two distinct methyl glucosides, known as $α$ -methyl glucoside and $β$ -methyl glucoside. These different isomeric forms and derivatives are a result of the variations in the spatial arrangement of atoms around carbon atom $(C_{1})$ in the glucose molecule. So, option (2) is correct.

CHXII14:BIOMOLECULES

324616 Assertion :
Glucose gives reddish brown precipitate with Fehling solution.
Reason :
Reaction of glucose with Fehling solution gives $CuO$ and gluconic acid.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Both Assertion and Reason are correct.

Explanation:

Glucose gives reddish brown precipitate with Fehling solution consists of ${Cu}^{2 +}$ which gets reduced to ${Cu}^{+} ({Cu}_{2} O)$ , not to $CuO$ .
$\underset{Glu cose}{C_{6} H_{12} O_{6}} + 2CuO \overset{O H^{-}}{\to} C_{5} \underset{Gluconic acid}{H_{11} O_{5} COOH} + C u_{2} O$

AIIMS - 2017

CHXII14:BIOMOLECULES

324617 D-Glucose reacts with phenylhydrazine to make osazone. How many molecules of phenylhydrazine are used for this reaction per molecule of D-glucose?

1 One

2 Two

3 Three

4 Four

CHXII14:BIOMOLECULES

324614 D-glucose reacts with anhydrous methyl alcohol in the presence of dry $HCl$ gas to form :

1 2, 3, 4, 5, 6-penta -O -methyl D-glucose

2

α

-methyl D- glucopyranoside

3

β

-methyl D-glucopyranoside

4 Both (2) and (3)

CHXII14:BIOMOLECULES

324615 Assertion :
Glucose when treated with ${CH}_{3} OH$ in presence of dry $HCl$ gas gives $α$ and $β$ -methyl glucosides.
Reason :
Glucose reacts with phenyl hydrazine to form crystalline osazone.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Due to the ring structure formed by glucose, the carbon atom labeled as $(C_{1})$ becomes chiral. As a result, glucose exists in two stereoisomeric forms: $α$ -glucose and $β$ -glucose, corresponding to each stereoisomeric configuration.
Furthermore, glucose can form two distinct methyl glucosides, known as $α$ -methyl glucoside and $β$ -methyl glucoside. These different isomeric forms and derivatives are a result of the variations in the spatial arrangement of atoms around carbon atom $(C_{1})$ in the glucose molecule. So, option (2) is correct.

CHXII14:BIOMOLECULES

324616 Assertion :
Glucose gives reddish brown precipitate with Fehling solution.
Reason :
Reaction of glucose with Fehling solution gives $CuO$ and gluconic acid.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Both Assertion and Reason are correct.

Explanation:

Glucose gives reddish brown precipitate with Fehling solution consists of ${Cu}^{2 +}$ which gets reduced to ${Cu}^{+} ({Cu}_{2} O)$ , not to $CuO$ .
$\underset{Glu cose}{C_{6} H_{12} O_{6}} + 2CuO \overset{O H^{-}}{\to} C_{5} \underset{Gluconic acid}{H_{11} O_{5} COOH} + C u_{2} O$

AIIMS - 2017

CHXII14:BIOMOLECULES

324617 D-Glucose reacts with phenylhydrazine to make osazone. How many molecules of phenylhydrazine are used for this reaction per molecule of D-glucose?

1 One

2 Two

3 Three

4 Four

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