QBManager

CHXII14:BIOMOLECULES

324622 Glucose undergoes oxidation reaction in the presence of $n$ -moles of periodic acid forming mixture of formic acid and formaldehyde. The ratio of number of moles of periodic acid required to the number of chiral carbons present in reactant molecule is ____ .

1 0.5

2 1.25

3 2.5

4 5

Explanation:

supporting img
Chiral carbon atoms in glucose $= 4$
$\begin{array}{l} R a t i o = \frac{5}{4} (n = 5) \\ = 1 .25 \end{array}$

CHXII14:BIOMOLECULES

324623 Glucose + Tollen's reagent $⟶$ Silver mirror,
the above process shows

1 presence of -

COOH

group

2 presence of keto group

3 presence of - CHO group

4 presence of -

{CONH}_{2}

group

Explanation:

supporting img
This reaction indicates the presence of - $CHO$ group in glucose.

CHXII14:BIOMOLECULES

324624 Assertion :
Glucose is used in silvering of mirrors.
Reason :
Glucose is less acidic than a monohydric alcohol.

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:

Glucose being the reducing sugar undergoes Tollen's test giving silver mirror (known as silvering). $K_{a}$ for glucose is $6.6 \times 10^{- 12}$ and $K_{a}$ for $C_{2} H_{5} OH$ is $7.4 \times 10^{- 20}$ . Thus, glucose is more acidic than a monohydric alcohol. So, option (3) is correct.

CHXII14:BIOMOLECULES

324625 Consider the statements
I. The $[α]_{D}$ of sucrose is $+ 66 {.5}^{\circ}$
II. The $[α]_{D}$ of $α$ -D-Glucose is $+ 52 {.5}^{\circ}$
III. The $[α]_{D}$ of $β$ -D-Fructose is $+ 92 {.4}^{\circ}$
The correct statements is/are

1 I, II and III

2 Only I

3 Only III

4 I and III

Explanation:

$α - D$ - Glucose specific rotation is $+ 112^{\circ}$ .
$β - D$ Fructose specific rotation is $- 133^{\circ}$
Sugar specific rotation is $+ 66 {.5}^{\circ}$

CHXII14:BIOMOLECULES

324626 Which of the following reactions of glucose can be explained only by its cyclic structure?

1 Glucose forms pentaacetate.

2 Glucose reacts with hydroxylamine to form an oxime.

3 Pentaacetate of glucose does not react with hydroxylamine.

4 Glucose is oxidised by nitric acid to gluconic acid.

CHXII14:BIOMOLECULES

324622 Glucose undergoes oxidation reaction in the presence of $n$ -moles of periodic acid forming mixture of formic acid and formaldehyde. The ratio of number of moles of periodic acid required to the number of chiral carbons present in reactant molecule is ____ .

1 0.5

2 1.25

3 2.5

4 5

Explanation:

supporting img
Chiral carbon atoms in glucose $= 4$
$\begin{array}{l} R a t i o = \frac{5}{4} (n = 5) \\ = 1 .25 \end{array}$

CHXII14:BIOMOLECULES

324623 Glucose + Tollen's reagent $⟶$ Silver mirror,
the above process shows

1 presence of -

COOH

group

2 presence of keto group

3 presence of - CHO group

4 presence of -

{CONH}_{2}

group

Explanation:

supporting img
This reaction indicates the presence of - $CHO$ group in glucose.

CHXII14:BIOMOLECULES

324624 Assertion :
Glucose is used in silvering of mirrors.
Reason :
Glucose is less acidic than a monohydric alcohol.

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:

Glucose being the reducing sugar undergoes Tollen's test giving silver mirror (known as silvering). $K_{a}$ for glucose is $6.6 \times 10^{- 12}$ and $K_{a}$ for $C_{2} H_{5} OH$ is $7.4 \times 10^{- 20}$ . Thus, glucose is more acidic than a monohydric alcohol. So, option (3) is correct.

CHXII14:BIOMOLECULES

324625 Consider the statements
I. The $[α]_{D}$ of sucrose is $+ 66 {.5}^{\circ}$
II. The $[α]_{D}$ of $α$ -D-Glucose is $+ 52 {.5}^{\circ}$
III. The $[α]_{D}$ of $β$ -D-Fructose is $+ 92 {.4}^{\circ}$
The correct statements is/are

1 I, II and III

2 Only I

3 Only III

4 I and III

Explanation:

$α - D$ - Glucose specific rotation is $+ 112^{\circ}$ .
$β - D$ Fructose specific rotation is $- 133^{\circ}$
Sugar specific rotation is $+ 66 {.5}^{\circ}$

CHXII14:BIOMOLECULES

324626 Which of the following reactions of glucose can be explained only by its cyclic structure?

1 Glucose forms pentaacetate.

2 Glucose reacts with hydroxylamine to form an oxime.

3 Pentaacetate of glucose does not react with hydroxylamine.

4 Glucose is oxidised by nitric acid to gluconic acid.

CHXII14:BIOMOLECULES

324622 Glucose undergoes oxidation reaction in the presence of $n$ -moles of periodic acid forming mixture of formic acid and formaldehyde. The ratio of number of moles of periodic acid required to the number of chiral carbons present in reactant molecule is ____ .

1 0.5

2 1.25

3 2.5

4 5

Explanation:

supporting img
Chiral carbon atoms in glucose $= 4$
$\begin{array}{l} R a t i o = \frac{5}{4} (n = 5) \\ = 1 .25 \end{array}$

CHXII14:BIOMOLECULES

324623 Glucose + Tollen's reagent $⟶$ Silver mirror,
the above process shows

1 presence of -

COOH

group

2 presence of keto group

3 presence of - CHO group

4 presence of -

{CONH}_{2}

group

Explanation:

supporting img
This reaction indicates the presence of - $CHO$ group in glucose.

CHXII14:BIOMOLECULES

324624 Assertion :
Glucose is used in silvering of mirrors.
Reason :
Glucose is less acidic than a monohydric alcohol.

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:

Glucose being the reducing sugar undergoes Tollen's test giving silver mirror (known as silvering). $K_{a}$ for glucose is $6.6 \times 10^{- 12}$ and $K_{a}$ for $C_{2} H_{5} OH$ is $7.4 \times 10^{- 20}$ . Thus, glucose is more acidic than a monohydric alcohol. So, option (3) is correct.

CHXII14:BIOMOLECULES

324625 Consider the statements
I. The $[α]_{D}$ of sucrose is $+ 66 {.5}^{\circ}$
II. The $[α]_{D}$ of $α$ -D-Glucose is $+ 52 {.5}^{\circ}$
III. The $[α]_{D}$ of $β$ -D-Fructose is $+ 92 {.4}^{\circ}$
The correct statements is/are

1 I, II and III

2 Only I

3 Only III

4 I and III

Explanation:

$α - D$ - Glucose specific rotation is $+ 112^{\circ}$ .
$β - D$ Fructose specific rotation is $- 133^{\circ}$
Sugar specific rotation is $+ 66 {.5}^{\circ}$

CHXII14:BIOMOLECULES

324626 Which of the following reactions of glucose can be explained only by its cyclic structure?

1 Glucose forms pentaacetate.

2 Glucose reacts with hydroxylamine to form an oxime.

3 Pentaacetate of glucose does not react with hydroxylamine.

4 Glucose is oxidised by nitric acid to gluconic acid.

CHXII14:BIOMOLECULES

324622 Glucose undergoes oxidation reaction in the presence of $n$ -moles of periodic acid forming mixture of formic acid and formaldehyde. The ratio of number of moles of periodic acid required to the number of chiral carbons present in reactant molecule is ____ .

1 0.5

2 1.25

3 2.5

4 5

Explanation:

supporting img
Chiral carbon atoms in glucose $= 4$
$\begin{array}{l} R a t i o = \frac{5}{4} (n = 5) \\ = 1 .25 \end{array}$

CHXII14:BIOMOLECULES

324623 Glucose + Tollen's reagent $⟶$ Silver mirror,
the above process shows

1 presence of -

COOH

group

2 presence of keto group

3 presence of - CHO group

4 presence of -

{CONH}_{2}

group

Explanation:

supporting img
This reaction indicates the presence of - $CHO$ group in glucose.

CHXII14:BIOMOLECULES

324624 Assertion :
Glucose is used in silvering of mirrors.
Reason :
Glucose is less acidic than a monohydric alcohol.

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:

Glucose being the reducing sugar undergoes Tollen's test giving silver mirror (known as silvering). $K_{a}$ for glucose is $6.6 \times 10^{- 12}$ and $K_{a}$ for $C_{2} H_{5} OH$ is $7.4 \times 10^{- 20}$ . Thus, glucose is more acidic than a monohydric alcohol. So, option (3) is correct.

CHXII14:BIOMOLECULES

324625 Consider the statements
I. The $[α]_{D}$ of sucrose is $+ 66 {.5}^{\circ}$
II. The $[α]_{D}$ of $α$ -D-Glucose is $+ 52 {.5}^{\circ}$
III. The $[α]_{D}$ of $β$ -D-Fructose is $+ 92 {.4}^{\circ}$
The correct statements is/are

1 I, II and III

2 Only I

3 Only III

4 I and III

Explanation:

$α - D$ - Glucose specific rotation is $+ 112^{\circ}$ .
$β - D$ Fructose specific rotation is $- 133^{\circ}$
Sugar specific rotation is $+ 66 {.5}^{\circ}$

CHXII14:BIOMOLECULES

324626 Which of the following reactions of glucose can be explained only by its cyclic structure?

1 Glucose forms pentaacetate.

2 Glucose reacts with hydroxylamine to form an oxime.

3 Pentaacetate of glucose does not react with hydroxylamine.

4 Glucose is oxidised by nitric acid to gluconic acid.

CHXII14:BIOMOLECULES

324622 Glucose undergoes oxidation reaction in the presence of $n$ -moles of periodic acid forming mixture of formic acid and formaldehyde. The ratio of number of moles of periodic acid required to the number of chiral carbons present in reactant molecule is ____ .

1 0.5

2 1.25

3 2.5

4 5

Explanation:

supporting img
Chiral carbon atoms in glucose $= 4$
$\begin{array}{l} R a t i o = \frac{5}{4} (n = 5) \\ = 1 .25 \end{array}$

CHXII14:BIOMOLECULES

324623 Glucose + Tollen's reagent $⟶$ Silver mirror,
the above process shows

1 presence of -

COOH

group

2 presence of keto group

3 presence of - CHO group

4 presence of -

{CONH}_{2}

group

Explanation:

supporting img
This reaction indicates the presence of - $CHO$ group in glucose.

CHXII14:BIOMOLECULES

324624 Assertion :
Glucose is used in silvering of mirrors.
Reason :
Glucose is less acidic than a monohydric alcohol.

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:

Glucose being the reducing sugar undergoes Tollen's test giving silver mirror (known as silvering). $K_{a}$ for glucose is $6.6 \times 10^{- 12}$ and $K_{a}$ for $C_{2} H_{5} OH$ is $7.4 \times 10^{- 20}$ . Thus, glucose is more acidic than a monohydric alcohol. So, option (3) is correct.

CHXII14:BIOMOLECULES

324625 Consider the statements
I. The $[α]_{D}$ of sucrose is $+ 66 {.5}^{\circ}$
II. The $[α]_{D}$ of $α$ -D-Glucose is $+ 52 {.5}^{\circ}$
III. The $[α]_{D}$ of $β$ -D-Fructose is $+ 92 {.4}^{\circ}$
The correct statements is/are

1 I, II and III

2 Only I

3 Only III

4 I and III

Explanation:

$α - D$ - Glucose specific rotation is $+ 112^{\circ}$ .
$β - D$ Fructose specific rotation is $- 133^{\circ}$
Sugar specific rotation is $+ 66 {.5}^{\circ}$

CHXII14:BIOMOLECULES

324626 Which of the following reactions of glucose can be explained only by its cyclic structure?

1 Glucose forms pentaacetate.

2 Glucose reacts with hydroxylamine to form an oxime.

3 Pentaacetate of glucose does not react with hydroxylamine.

4 Glucose is oxidised by nitric acid to gluconic acid.