Statement I: D-glucose pentacetate reacts with 2,4-dinitrophenylhydrazine. Statement II: Starch, on heating with concentrated sulfuric acid at 100°C and 2–3 atmosphere pressure produces glucose. [2025]

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Q.
Given below are two statements: [2025]

Statement I: D-glucose pentacetate reacts with 2,4-dinitrophenylhydrazine.

Statement II: Starch, on heating with concentrated sulfuric acid at 100°C and 2–3 atmosphere pressure produces glucose.

In the light of the above statements, choose the correct answer from the options given below:

1 Both Statement I and Statement II are false

2 Both Statement I and Statement II are true

3 Statement I is true but Statement II is false

4 Statement I is false but Statement II is true

Ans.
(4)

The pentaacetate of glucose does not react with 2,4-dinitrophenylhydrazine indicating the absence of free —CHO group.

Starch is a polymer of $α$ -D-glucose, hence upon hydrolysis of starch, glucose is produced.

Solution

1 Both Statement I and Statement II are false

2 Both Statement I and Statement II are true

3 Statement I is true but Statement II is false

4 Statement I is false but Statement II is true

Ans.
(4)

The pentaacetate of glucose does not react with 2,4-dinitrophenylhydrazine indicating the absence of free —CHO group.

Starch is a polymer of $α$ -D-glucose, hence upon hydrolysis of starch, glucose is produced.

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Solution

1 Both Statement I and Statement II are false

2 Both Statement I and Statement II are true

3 Statement I is true but Statement II is false

4 Statement I is false but Statement II is true

Ans. (4) The pentaacetate of glucose does not react with 2,4-dinitrophenylhydrazine indicating the absence of free —CHO group. Starch is a polymer of α-D-glucose, hence upon hydrolysis of starch, glucose is produced.

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Ans.
(4)

The pentaacetate of glucose does not react with 2,4-dinitrophenylhydrazine indicating the absence of free —CHO group.

Starch is a polymer of $α$ -D-glucose, hence upon hydrolysis of starch, glucose is produced.