Monosaccharide Anomers

Q. Assertion :The two cyclic hemiacetal forms of glucose, $\alpha -$ form and $\beta -$ form are called anomers. Reason: Anomers differ only in the configuration of the hydroxyl group at $C-1$.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Consider the following statements: D-glucose, D-galactose and D-fructose are all
1.Isomers
2.Epimers
3.Aldohexoses
4.Monosaccharides
Which of the above statements are correct?

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

Q.

α - D - glucose and β - D - glucose differ from each other due to the difference in one of the carbons with respect to its ________.

1. Number of OH groups
2. Conformation
3. Size of hemiacetal ring
4. Configuration

Q. When a monosaccharide forms a cyclic hemiacetal, the carbon atom that contained the carbonyl group is identified as the ______ carbon atom, because:

1. $D$, the carbonyl group is drawn to the right
2. $L$, the carbonyl group is drawn to the left
3. Acetal, it forms bond to an $-OR$ and an $-O{R}^{{}^{\prime }}$
4. Anomeric, its substituents can assume an $\beta$ or $\alpha$ position

Q. The two forms of D-glucopyranose obtained from the solution of D-glucose are called:

1. enantiomer
2. epimer
3. anomer
4. isomer

Q. Pyranose ring structure of glucose is due to hemiacetal formation between:

1. C${}_1$and C${}_5$
2. C${}_2$and C${}_4$
3. C${}_1$and C${}_4$
4. C${}_1$and C${}_3$

Q. Two forms of D-glucopyranose, are called_________.

1. enantiomers
2. diastereomers
3. anomers
4. epimers

Q. The molecular formula for glucose is $C_6{H}_{12}{O}_6$. What would be the formula for a polymer made by linking ten glucose molecules together by dehydration reactions?

1. $C_{20}{H}_{120}{O}_{60}$
2. $C_{60}{H}_{100}{O}_{50}$
3. $C_{60}{H}_{102}{O}_{51}$
4. $C_{60}{H}_{111}{O}_{51}$

Q. Identify the correct set of stereochemical relationships amongst the following monosaccharides $-I-IV$.

1. $I$ and $II$ are anomers; $III$ and $IV$ are epimers.
2. $I$ and $II$ are epimers; $II$ and $IV$ are anomers
3. $I$ and $III$ are epimers; $III$ and $IV$ are anomers
4. $I$ and $III$ are anomers; $I$ and $II$ are epimers

Q. Methyl $\alpha$-D-glucoside is actually a:

1. hemi-acetal
2. carboxylic acid
3. acetal
4. amine

Q. The correct statements about anomers are:

1. Anomer have different stereochemistry at the anomeric carbon atom
2. $\alpha -D-$Glucopyranose and $\beta -D-$Glucopyranose are anomers
3. $\alpha -D-$Glucopyranose and $\beta -D-$Glucopyranose are diastereomer
4. When pure $\alpha -D-$Glucopyranose is dissolved in water its optical rotation slowly changes

Q. The term anomers of glucose refers to:

1. isomers of glucose that differ in configurations at carbons one and four (C-1 and C-4)
2. a mixture of (D)-glucose and (L)-glucose
3. enantiomers of glucose
4. isomers of glucose that differ in configuration at carbon one (C-1)

Q. The specific rotation of two glucose anomers are $\alpha =+{110}^{\circ }$ and $\beta =+{19}^{\circ }$ and for the constant equilibrium mixture is $+{52.7}^{\circ }$. Calculate the percent composition of the anomers in the equilibrium mixture.

Q. The two form of D-glucopyranose obtained from the solution of D-glucose are called

1. Isomer
2. Anomer
3. Epimer
4. Enantiomer

Q. The term anomers of glucose refers to:

1. isomers of glucose that differs in configuration at carbons one and four (C-1 and C-4)
2. a mixture of (D-) glucose arid (L-) glucose
3. enantiomers of glucose
4. isomers of glucose that differ in configuration at carbon one (C-1)

Q. Three cyclic structures of monosaccharides are given below. Which of these are anomers?

1. $II$ and $III$
2. $I$ and $II$
3. $I$ and $III$
4. $III$ is anomer of $I$ and $II$

Q. The two forms of D-glucopyranose obtained from D-glucose are known as:

1. epimers
2. enantiomers
3. geometrical isomers
4. anomers

Q. Write a reaction which shows that all the atoms in glucose are linked in a straight chain.

Q. $\alpha$-D-glucose and $\beta$-D-glucose are examples of:

1. enantiomers
2. tautomers
3. anomers
4. epimers