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PPSC Lecturer Chemistry Test 37 Online Preparation MCQs

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Test Instructions:-
Test Name	Lecturer Chemistry
Subject	Chemistry Test 37
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC LECTURER OF CHEMISTRY TEST NO. 37

1 / 25

Which of the following would give a positive Tollen’s test?

methyl β-D-glucopyranoside

α-D-glucopyranose

methyl α-D-ribofuranoside

sucrose

2 / 25

The bond angle between carbon atoms in cyclohexane is

120°

60°

109.5°

90°

3 / 25

Which is a monosaccharide?

Cellulose

Maltose

Galactose

Sucrose

4 / 25

An aqueous solution of glucose behaves as an aldehyde because:

it is hydrolyzed by water to the free aldehyde

glucose is actually a cyclic aldehyde

it is a ketone, but is in equilibrium with the aldehyde form

its cyclic hemiacetal, the predominant form, is in equilibrium with the free aldehyde form

5 / 25

What percentage of cyclohexane molecule is estimated to be in the boat form at any given time?

less than 1%

between 90% and 99%

approximately 50%

over 99%

6 / 25

Which is a disaccharide?

Fructose

Cellulose

Maltose

Glucose

7 / 25

Uriedes are

None of these

Halogen derivatives of urea

Acetyl derivatives of urea

Alkyl derivatives of urea

8 / 25

All chiral D-sugars rotate plane-polarized light :

+20.0°

clockwise

in a direction that cannot be predicted but must be determined experimentally

counterclockwise

9 / 25

Monosaccharides are classified according to :

all of the above.

the number of carbon atoms in the molecule.

whether they contain an aldehyde or a ketone group.

their configurational relationship to glyceraldehyde.

10 / 25

Uric acid on oxidation with alkaline KMnO4 forms :

Allantoin

Caffeine

Barbituric acid

Urea

11 / 25

Which of the following statements best describes the meaning of “mutarotation”?

a rapid exchange between the D and L forms

a slow exchange between hydrogen and deuterated hydrogen

a rapid exchange between the α and β forms of diastereomeric sugars

a slow change in optical rotation to reach an equilibrium value

12 / 25

A carbohydrate composed of three to ten sugar molecules is called a(n) :

monosaccharide

disaccharide

polysaccharide

oligosaccharide

13 / 25

Which of the following statements best describes the meaning of a “glycoside”?

It is the mirror image of a sugar.

It is the hemiacetal of a sugar.

It is the enantiomer of a sugar.

It is the acetal of a sugar.

14 / 25

How many chirality centers are there in a 2-ketohexose?

15 / 25

Which of the following statements best describes the difference between amylose and amylopectin?

Amylose is a straight-chain polysaccharide while amylopectin is a branched polysaccharide.

Amylose is composed of thousands of D-glucose units while amylopectin is composed of thousands of D-galactose units.

Amylose contains α-1,6-glycosidic linkage which amylopectin does not contain.

Amylose is a branched polysaccharide while amylopectin is a chain polysaccharide.

16 / 25

The principal sugar in blood is

Sucrose

Galactose

Fructose

Glucose

17 / 25

How many stereoisomers are possible for a 2-ketohexose?

18 / 25

Diethyl malonate reacts with urea in the presence of sodium ethoxide to form

Phenobarbital

Barbital

Uric acid

Barbituric acid

19 / 25

In solution, glucose exists as:

the cyclic hemiacetal form only

an equilibrium mixture of the open-chain form and cyclic hemiacetal forms

the open-chain form only

the cyclic acetal form only

20 / 25

Which term describes a sugar where one of the OH groups has been replaced with a hydrogen?

dehydroxy sugar

imino sugar

amino sugar

deoxy sugar

21 / 25

Which of the following is true about sucrose?

It hydrolyzes to fructose and glucose.

It undergoes mutarotation in water.

It is a reducing sugar.

It is a monosaccharide.

22 / 25

The designation D or L before the name of a monosaccharide

indicates the position of the asymmetric carbon atoms in the carbohydrate.

indicates the position of the OH group on the carbon next to the primary alcohol group.

indicates the length of the carbon chain in the carbohydrate.

indicates the direction of rotation of polarized light.

23 / 25

The most stable conformation of cyclohexane is the :

Boat form

Haworth form

Chair form

Boat form

24 / 25

Anomers of D-glucopyranose differ in their stereochemistry at

25 / 25

Which of the following is not a monosaccharide?

Fructose

Ribose

Sucrose

Glucose

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