Chemistry NCERT Exemplar Solutions Class 12th Chapter Fourteen

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

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 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 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.

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.

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

Oxidoreductases are enzymes that participate in redox reactions that involve oxidation reduction. They act as catalysts; one of these enzymes is Alcohol Dehydrogenase, which decreases the amount of alcohol in the human body after ingestion.

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

The formation of intramolecular H-bonding between the >C=O groups of amino acids in one turn and the? NH? groups of amino acids in the following turn stabilises a polypeptide chain in the a-helix shape of protein.

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

To make a polypeptide chain, the amino acid must be linked to the α− carbon of the molecule. The removal of water molecules from an α− amino acid results in the formation of a polypeptide chain.

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

Aldo-pentoses like ribose and 2 - deoxyribose are sugar moieties found in nucleic acids like RNA and DNA. The structures of these sugars are illustrated below. Both aldopentoses' D- configuration is configuration.

β−D-ribose is mentioned, and its structure is depicted below.

The structure of as β−D-deoxyribose, 2 - deoxyribose is given in the diagram below.