(a)
Sucrose is a disaccharide.
Fig. 2.1 shows how sucrose is broken down in a reaction with hydrochloric acid.
Fig. 2.1
[ 2 ]
(i)
Name the products, A and B, of the reaction shown in Fig. 2.1.
A
B
[ 2 ]
[Maximum number: 1]
A student used Benedict's solution to test a sample known to contain carbohydrate.
At the end of the test the solution was blue.
Which carbohydrate could be present in the sample?
A
glucose
B
fructose
C
maltose
D
sucrose
[Maximum number: 1]
Which two polysaccharides both have 1,6 glycosidic bonds and are branched?
A
amylopectin and amylose
B
amylopectin and glycogen
C
amylose and glycogen
D
glycogen and cellulose
[Maximum number: 1]
Three carbohydrate molecules are shown.
1
2
3
Which two molecules combine to form a molecule of sucrose?
A
1 and 2
B
1 and 3
C
2 and 3
D
two of molecule 1
[Maximum number: 1]
Heating with which solution breaks glycosidic bonds?
A
Benedict's solution
B
dilute hydrochloric acid
C
dilute sodium hydroxide
D
ethanol
[Maximum number: 1]
A student was provided with a solution of carbohydrate. They removed two samples from the solution and performed tests on each sample, as shown.
Which statement explains the results?
A
Condensation reactions occur in sample two to release reducing sugar.
B
Glycosidic bonds in a polysaccharide have been broken to release reducing sugar.
C
Sample one shows that sucrose is present in the carbohydrate solution.
D
The change in colour to a yellow solution shows that glucose is present.
[Maximum number: 1]
Two disaccharides are cellobiose and sucrose. Cellobiose is formed from two molecules of glucose, whilst sucrose is formed from fructose and glucose.
Which row shows the molecular formulae of the two disaccharides?
cellobiose
sucrose
[Maximum number: 1]
Which pair of monosaccharides forms sucrose?
A
B
C
D
[Maximum number: 1]
Which molecule is a disaccharide and a reducing sugar?
A
fructose
B
glucose
C
maltose
D
sucrose