Pyranose and Furanose

Q. Reducing sugar contains

1. > C = 0 group
2. None of these
3. −CHO group
4. A and B

Q.

The different ways to represent a carbohydrate molecule are _____.

1. Straight chain, Haworth Projection, chair and boat configuration.

2. Pyranose ring, straight chain, chair and boat configuration

3. Fischer projection, Haworth projection, Chair conformation.

4. Furanose ring, straight chain, Haworth projection

Q.

Verify$a-(-b)=a+b$ for the following values of $a$and $b$.

$a=21,b=18$

Q. The anomers of fructofuranose are called:

1. $\alpha$ anomers
2. $\beta$ anomers
3. none of these
4. both A and B

Q. An alcohol A when heated with copper give a product B not having oxygen atom. B on ozonolysis gives two isomeric products C and D. C on oxidation gives a monobasic acid E, silver salt of which ccontains 59.6%Ag.The structure of A is-?

Q. Name the two external factors that have favourable effect on the egg-laying of hens.

Q.

There are $200$ natural numbers between ${100}^2$ and ${101}^2$. State whether the statement is true (T) or false (F).

1. True
2. False

Q. The two anomers of fructofuranose are decided by ________ group.

1. acetal
2. hemiacetal
3. both A and B
4. none of these

Q. ntNo of moles of MnO4- required to oxidise one mole of ferrous oxalate completely in acidic medium will ben

Q. Reducing sugar contains

1. −CHO group
2. None of these
3. > C = 0 group
4. A and B

Q. What is the difference between lipids and fats?

Q. Why is it not advisable to dissolve KMnO4 in Conc. H2SO4 ?

Q. The optical rotation of the $\alpha$ form of pyranose is $+{150.7}^0$, that of the $\beta$ form is $+{52.8}^0$. In solution an equilibrium mixture of these anomers has an optical rotation of $+{80.2}^0$. The percentage of the $\alpha$ - form in equilibrium mixture is:

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

Q. Pick up the correct statement from the following:

1. Glucose exists in two different crystalline forms, $\alpha -D-$glucose and $\beta -D-$ glucose.
2. Cyclic structure of $\alpha -D-$glucose and $\beta -D-$ glucose is called pyranose structure.
3. $\alpha -D-$-glucose and $\beta -D-$ glucose are enantiomers.
4. Cellulose is a straight chain polysaccharide made up of only $\beta$- glucose units.

Q. State whether the following statements are True or False:
Both $\alpha -D-$glucose and $\beta -D-$glucose have the same specific rotation.

1. True
2. False

Q.

How many natural numbers are there between $89and210?$

Q. D - Glucose reacts with anhydrous methyl alcohol in the presence of dry $HCl$ gas to form

1. $\alpha$-methyl D - glucopyranoside
2. 2, 3, 4, 5, 6 - penta - O - methyl D - glucose
3. $\beta$-methyl D - glucopyranoside
4. Both (B) and (C)

Q. D-Ribose forms a five-membered ring.

1. True
2. False

Q. How many C-atoms are there is pyranose ring?

1. 3
2. 5
3. 6
4. 7

Q. Glucose forms many derivatives. The derivative which will help to prove the furanose structure is

1. Acetyl
2. Benzoyl
3. Osazone
4. Isopropylidene

Q. Study the structures of $\alpha -D-(+)$ glucopyranose and $\beta -D-(+)$ glucopyranose and mark the correct statement:

1. Structures I and II are anomers
2. Structures I and II are enantiomers
3. The two structures I and II differ in the configuration of $C_1$ and $C_4$
4. Both the structures I and II give 2, 4-DNP test

Q. The number of carbon atoms present in the ring of the D-glucopyranose are :

Q. Draw the structures of Harworth projection formula of fructose.

Q. Which of the following are the examples of monosaccharide-pyranose form?

1. D-fructofuranose
2. D-ribofuranose
3. D-glucopyranose
4. lactose

Q. When methyl D-Glucopyranoside is oxidized with periodic acid, how many moles of the oxidizing agent are consumed per mole of the sugar ?

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

Q. The cyclic structure of Glucose is very similar to __________.

1. pyran
2. benzene
3. furan
4. none of these

Q. Five-membered ring structures of fructose are given below. Mark the incorrect statement.

1. The five-membered ring structures are named as furanose structures
2. The cyclic structures represent two anomers of fructose
3. Five-membered ring structures are named as pyranose structures
4. These are also called Haworth structures

Q. What percentage of $\beta -D-(+)-$ glucopyranose is found at equilibrium in the aqueous solution?

1. $64$ %
2. $36$ %
3. $100$ %
4. $50$ %

Q. Draw the pyranose structure of glucose.

Q. Draw the simple Fischer projection formulae of D-$(+)$-glucose and D-$(-)$ fructose.