The change in the optical rotation of freshly prepared solution of glucose is known as
- racemisation
- specific rotation
- mutarotation
- tautomerism
The Correct Option is C
Approach Solution - 1
The correct answer is Option C) mutarotation
Freshly prepared glucose solution gets equilibrated to an unequal mixture of (+) and (-) glucose. This phenomenon is called mutarotation. They interconvert into α and β anomeric forms.
Read more from the chapter: Biomolecule
Approach Solution -2
The correct answer is Option C) mutarotation
Real Life Applications
- Mutarotation is a technique used in the brewing industry to regulate the sweetness of beer.
- The mutarotation method is employed in the wine business to assess the maturity of grapes.
- Mutarotation can be employed in the analytical chemistry lab to distinguish between various kinds of carbohydrates.
Question can also be asked as
- What are the two different forms of glucose that interconvert during mutarotation?
- What is the specific rotation of each of the two anomers?
- What is the equilibrium constant for the mutarotation of glucose?
- What factors affect the rate of mutarotation?
Approach Solution -3
The correct answer is Option C) mutarotation
Epimers are diastereomers that have only one chiral center. They differ in the placement of the -OH group in a single place. They are a pair of stereoisomers, that have the same formula and connectivity but their 3-D structure differs.
Example: D-Glucose and D-Galactose
Anomers are cyclic epimers monosaccharides and differ at C-1 if they are aldoses. And at C-2 if they are ketos.
Characteristics of Epimers
- They differ in a single carbon atom but have more than one chiral carbon.
- They are not mirror images of each other.
- Few chiral centers remain the same in epimers.
- They differ in their chemical and physical properties.
Mutarotation is the change in the optical rotation as there is a change in the anomers. For example, alpha and beta forms of glucose interconvert. The α and β anomers are diastereomers. Their specific rotation varies.
Read more:
| Related Concepts | ||
|---|---|---|
| Isomers | Carbohydrates | Stereochemistry |
| Carbon | Ketone | Organic chemistry |
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Concepts Used:
Organic Chemistry - Some Basic Principles and Techniques
Organic Chemistry is a subset of chemistry dealing with compounds of carbon. Therefore, we can say that Organic chemistry is the chemistry of carbon compounds and is 200-225 years old. Carbon forms bond with itself to form long chains of hydrocarbons, e.g.CH4, methane and CH3-CH3 ethane. Carbon has the ability to form carbon-carbon bonds quite elaborately. Polymers like polyethylene is a linear chain where hundreds of CH2 are linked together.
Read Also: Organic Compounds
Importance of Organic Chemistry:
Organic chemistry is applicable in a variety of areas including-
- Medicines: Example- Aspirin which is a headache medicine and Ibuprofen is a painkiller, both are organic compounds. Other examples include paracetamol.
- Food: Example- Starch which is a carbohydrate is an organic compound and a constituent of rice and other grains. It is the source of energy.
- Clothing: Example- Nylon, Polyester and Cotton are forms of organic compounds.
- Fuels: Examples- Gasoline, Petrol and Diesel are organic compounds used in the automobile industry at large.