Carbohydrate and amino acid
Carbohydrate and amino acid
1. Which one of the following is NOT correct for monosaccharides :
(a) They are optically active polyhydroxy carbonyl compounds.
(b) Fructose is ketose sugar and hence it does not give red precipitate with Fehling solution.
(c) a-D(+) glucose and b-D(+) glucose are anomers.
(d) Glucose and mannose are epimers.
2. Which one of the following is NOT correct for sucrose :
(a) Hydrolysis of sucrose with dilute acid yields an equimolar mixture of D-glucose and D-fructose.
(b) Acid hydrolysis of sucrose is accompanied by a change in optical rotation.
(c) The glycosidic linkage in sucrose is in between C-1 of glucose and C-2 of fructose.
(d) Aqueous solution of sucrose exhibits mutarotation.
#3. Consider the following statements about carbohydrates?
1. Bromine water can be used to differentiate between aldoses and ketoses.
2. All monosaccharides, whether aldose or ketose, are reducing sugars.
3. Osazone formation destroys the configuration about C-2 of an aldose, but does not affect the configuration of the rest of the molecule.
4. A pair of diastereomeric aldose which differ only in configuration about C-2 is termed as pair of anomers.
Which of the above statements are correct?
(a) 1, 2 and 4 (b) 2 and 4
(c) 1 and 4 (d) 1, 2 and 3
#4. When methyl glucopyranoside reacts with periodic acid, how many moles of the oxidising agent are consumed per mole of the sugar?
(a) 1 (b) 2
(c) 3 (d) four
1. (b)
2. (d)
3. (d)
4. (b)
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