Sucrose (C12H22O11) is a disaccharide made up of glucose and fructose. C1 of 𝜶-D-Glucose and C2 of 𝝱-D-fructose are joined by a glycosidic linkage to form sucrose. It is a non-reducing sugar as both reducing groups (aldehyde and ketone) are bonded together. Sucrose is a common sugar, which is extracted and refined from sugarcane for consumption as table sugar. Sucrose is dextrorotatory but on hydrolysis, the mixture becomes laevorotatory due to higher laevorotation of fructose and is known as invert sugar.
1. The phenomenon of mutarotation is not exhibited by
(a) (–) Fructose
(b) (+) Lactose
(c) (+) Maltose
(d) (+) Sucrose
Answer: (d)
2. Invert sugar is produced on hydrolysis of
(a) fructose
(b) dextrose
(c) sucrose
(d) glucose
Answer: (c)
3. The sweetest sugar is
(a) sucrose
(b) fructose
(c) maltose
(d) glucose
Answer: (b)
4. Which of the following is used as table sugar?
(a) Disaccharide of D-glucose
(b) D-glucose
(c) Monosaccharide
(d) Disaccharide of D-glucose and D-fructose
Answer: (d)
5. Sucrose is non-reducing sugar due to
(a) presence of α-hydroxy keto group
(b) its conversion to invert sugar
(c) the linkage between both the anomeric carbon atoms
(d) equal amount of D(+) glucose and D(–) fructose
Answer: (c)
6. Sucrose on hydrolysis yields
(a) two glucose molecules
(b) glucose and fructose
(c) glucose and lactose
(d) glucose and galactose
Answer: (b)
7. The general formula of carbohydrates is
(a) Cx(H2O)y
(b) Cx(H2)yO
(c) Cx(H2O)y + 2
(d) Cx – 1 (H2O)y
Answer: (a)
8. This is not a disaccharide
(a) maltose
(b) galactose
(c) sucrose
(d) lactose
Answer: (b)
9. Which of the following sugars does not give positive Seliwanoff’s test?
(a) Inulin
(b) Sucrose
(c) Fructose
(d) Maltose
Answer: (d)
10. Which of the following is a non-reducing sugar?
(a) Sucrose
(b) Maltose
(c) Lactose
(d) Glucose
Answer: (a)
11. Which of the following is invert sugar?
(a) Starch
(b) Glucose
(c) Fructose
(d) None of these
Answer: (d)
Invert sugar is a mixture of fructose and glucose by applying heat and an acid, such as a cream of tartar or citric acid.
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