Advertisements
Advertisements
Question
Explain D and L configuration in sugars.
Advertisements
Solution
D and L configuration in sugars:
- Conventionally (+)-glyceraldehyde is represented by the Fischer projection formula having –OH group attached to C-2 on the right side and this configuration is denoted by symbol ‘D’.
- Similarly, the configuration of (–) glyceraldehyde is denoted by the symbol ‘L’.
- All the compounds which can be correlated by a series of chemical reactions to (+)-glyceraldehyde are said to have D-configuration.
- And compounds which are chemically correlated to (–)-glyceraldehyde are said to have L-configuration. This is the system of the relative configuration of chiral compounds.
- A monosaccharide is assigned D/L configuration on the basis of the configuration of the lowest chiral carbon in its Fischer projection formula.
- Relative configuration of (+)-glucose with respect to (+)-glyceraldehyde can be drawn as follows:
APPEARS IN
RELATED QUESTIONS
\[\ce{CH2OH-CO-(CHOH)4-CH2OH}\] is an example of ______.
The glycosidic linkage in maltose is formed between _______________
Write chemical reaction for following conversions
glucose into glucoxime
Write a chemical reaction to convert glucose into glucose cyanohydrin.
By which of the following process formation of glycosidic bond occurs?
Which of the following type of carbohydrates cannot be hydrolyzed?
Identify the given structure 'P' and 'Q'.
Identify the substances having glycosidic bond and peptide bond, respectively in their structure:
Which enzymes would work sequentially on potatoes consumed by an individual?
Which of the following monosaccharides is a tetrose sugar?
Which of the following carbohydrate is sweet to taste?
______ is the prosthetic group of glycoproteins.
The reserve food material in animals is ____________.
Identify the sugar having the molecular formula C6H1206.
Fructose is the fruit sugar and chemically it is ketohexose but it has a ______ rather than a ______.
Raffinose, sucrose and stachyose are respectively ____________.
All these carbohydrates contain \[\ce{1 -> 4β}\] glycosidic linkage, EXCEPT ____________.
Identify the INCORRECT statement regarding glucose.
One mole of a carbohydrate on hydrolysis gives one mole of glucose and one mole of galactose. Identify the carbohydrate.
Which of the following monosaccharide is a ketohexose?
The general formula for polysaccharide is ____________.
Which one of the following is a carbohydrate but does NOT follow the general formula of carbohydrate?
Which one of the following is Tetrose sugar?
Which one of the following carbohydrates is insoluble in water?
Which one of the following is NOT soluble in water?
Glucose and gluconic acid treated with dilute nitric acid forms saccharic acid. What does this indicate?
When 2 moles of stachyose is hydrolyzed, the number of moles of galactose obtained is ____________.
Which among the following reagents is used for conversion of glucose to glucoxime?
Identify the product Y in the following reaction.
\[\ce{Maltose ->[Hydrolysis] X ->[dil. HNO3][(excess)] Y}\]
Which among the following is a product of hydrolysis of one mole raffinose?
When one mole of lactose is hydrolysed, the hydrolysate contains ____________.
Which one given below is a non-reducing sugar?
Why carbohydrates are generally optically active?
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Starch
Classify the following into monosaccharides, oligosaccharides and polysaccharides.
Lactose
Write the structure of α-D (+) glucopyranose.
Is the following sugar, D-sugar or L-sugar?
Which of the following groups contain polysaccharides?
Match the Column I with Column II and choose the correct answer from options below:
| Column I | Column II |
| A. Purine | 1. Glycogen |
| B. Pyrimidine | 2. Cellulose |
| C. Structural polysaccharide | 3. Glucagon |
| D. Storage polysaccharide | 4. Adenine |
| 5. Cytosine |
Identify the monosaccharide containing only one asymmetric carbon atom in its molecule.
Corn is immersed in boiling water. It is then cooled, and the solution becomes sweet. It is due to ______.
Which one is a non-reducing commercial sugar?
Why carbohydrates are generally optically active.
Why carbohydrates are generally optically active.
Why carbohydrates are generally optically active?
Describe the action of the following reagent on glucose:
dil. Nitric acid.
Write the ring structure of glucose.
CH2 OH - CO - (CHOH)4 - CH2 OH is an example of ______.
Why carbohydrates are generally optically active?
Why carbohydrates are generally optically active?
The sugar found in milk is ______.
