Class 12th

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Sucrose acts as a dextrorotatory molecule. It produces a mixture of glucose and fructose when hydrolyzed, with particular rotations of +52.5? and −92.4? The net resultant mixture is laevorotatory because fructose laevorotation is greater than glucose dextrorotation. The sign of rotation shifts from dextro to laevo as a result of sucrose hydrolysis, and the resulting compound is known as invert sugar.

This is a Short Type Questions as classified in NCERT Exemplar

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This is a Short Answer Type Questions as classified in NCERT Exemplar

Excess vitamin C is easily removed in the urine since it is water soluble. As a result, it can't be stored in the body and must be ingested frequently.

 This is a Short Type Questions as classified in NCERT Exemplar

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This is a Short Answer Type Questions as classified in NCERT Exemplar

The given structure A is glucose pentaacetate, which lacks a free hydroxyl? OH or carbon -CHO group. As a result, it cannot be transferred to the open chain form to make a free group, and therefore the oxime is not produced.

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This is a Short Answer Type Questions as classified in NCERT Exemplar

When glucose is acetylated with acetic anhydride, a penta-acetyl derivative is produced. The reaction is depicted in the diagram below.

This confirms the presence of five -OH groups.

This is a Short Answer Type Questions as classified in NCERT Exemplar

During the curdling process, the lactose sugar in milk is converted to lactic acid.

Milk curdling is caused by lactic acid-producing bacteria found in milk. Protein denaturation is an example. When a protein is exposed to physical or chemical alterations, it is said to be modified. The hydrogen bond has been shattered. Globules open up, helices uncoil, and proteins lose their biological function.

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This is an example of an electrophilic aromatic substitution reaction. phenol generates phenoxide ion in alkaline medium, which is more electron-rich than phenol and thus more reactive to electrophilic attack. In this reaction, the electrophile is an aryldiazonium cation.

The faster the reaction, the stronger the electrophile.

The cation p-nitrophenyldiazonium is a stronger electrophile than the cation p-toluene diazonium.

As a result, it preferentially couples with phenol.