Mutarotation

Q. The number of chiral carbons in D-glucose is:

1. five
2. six
3. three
4. four

Q.

Number of chiral carbons in
$\beta -D-(+)$-glucose is:

1. Three

2. Four

3. Six

4. Five

Q. Sucrose consists of which of the following monosaccharide units?

1. Fructose, galactose
2. Fructose, glucose
3. Galactose, glucose
4. Glucose, glucose

Q. Why glucose is called glucopyranose?

1. Glucose is aldohexose
2. Glucose is a heterocyclic compound contianing five carbon atoms and one oxygen atom
3. Glucose is ketohexose
4. Glucose is a heterocyclic compound containing six carbon atoms

Q. The six membered cyclic structure of glucose is called pyranose structure ​(𝛼- or 𝛽-form), in analogy with Pyran. The correct structure of Pyran is:

1. 
2. 
3. 
4. 

Q. The optical rotation of the $\alpha -$ form of a pyranose is $+{150.7}^{\circ },$ that of the $\beta$ form is $+{52.8}^{\circ }$. In solution an equilibrium mixture of the anomers has an optical rotation of $+{80.2}^{\circ }$. The percentage of the $\alpha -$ form at
equilibrium is

1. $28\%$
2. $32\%$
3. $68\%$
4. $72\%$

Q. The optical rotation of the $\alpha$- form of a pyranose is $+{150.7}^{\circ }$, that of the $\beta$-form is $+{52.8}^{\circ }$. In solution an equilibrium mixture of these anomers has an optical rotation of $+{80.2}^{\circ }$. The percentage of the $\alpha$- form in equilibrium mixture is:

1. 68%
2. 28%
3. 32%
4. 72%

Q.

Number of chiral carbons in
$\beta -D-(+)$-glucose is:

1. Three

2. Four

3. Five

4. Six

Q. Which one given below is a reducing sugar?

1. Glucose
2. Sucrose
3. Maltose
4. Lactose

Q. which carbohydrates does not show mutarotation?

Q.

Which one is a disaccharide ?

1. Sucrose

2. Glucose

3. Fructose

4. Xylose

Q. Which of the following compounds will undergo racemisation when solution of $KOH$ hydrolyses?

1. 1 and 2
2. 2 and 4
3. 3 and 4
4. 1 and 4

Q.
The product A and B in the above reaction are

1. C-2 epimers
2. Both A and B
3. Anomers
4. Diastereomers

Q. which among theb following has highest flocculatingn power 1nacl 2. mgso4 3. mgcl2 why nacl explai with reas on

Q.

Which one is a disaccharide ?

1. Glucose

2. Fructose

3. Xylose

4. Sucrose

Q. What are monosaccharides?

Q. The reaction, $Sucrose\underset{}{\overset{H^{+}}{\to }}Glucose+Fructose$, takes place at certain temperature while the volume of solution is maintained at $1$ litre. At time zero the initial rotation of the mixture is ${34}^{o}C$.After $30$ minutes the total rotation of solution is ${19}^{o}C$ and after a very long time, the total rotation is ${-11}^{o}C$. Find the time when solution was optically inactive?

1. $45$ min
2. $38.7$ min
3. $135$ min
4. $103.7$ min

Q.

Which of the following carbohydrate is an example of an oligosaccharide?

1. Glucose

2. Mannose

3. Cellulose

4. Lactose

Q. The process of separating a racemic mixture into optically pure $(+)$ and $(-)$ enantiomers is known as :

1. mutarotation
2. epimerization
3. asymmetric synthesis
4. resolution

Q. The number of chiral carbons in D-glucose is:

Q. which carbohydrates does not show mutarotation?

Q. What is chiral carbon and what are d and l glucose?