organic chemistry MCQs

PPSC Lecturer Chemistry Test 37 Online Preparation MCQs

Given below on this Website Online Free Taleem is free online MCQ’s test related to PPSC of Lecturer Chemistry. All the individuals who are going to appear in PPSC Lecturer of Chemistry written test can attempt these tests in order to prepare for it in best possible way. Our tests include all the important questions MCQs of Lecturer of PPSC Chemistry, all Past Papers of Lecturer of Chemistry PPSC that have extremely high amount of chances for been included in the actual exam which make our test undoubtedly the best source of preparation.

Note:-

There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
Practice this test at least 5 times if you want to secure High Marks.
At the End of the Test you can see your Test score and Rating.
If you found any incorrect answer in Quiz. Simply click on the quiz title and comment below on that MCQ. So that I can update the incorrect answer on time.

Please Click Below START Button to Take this Lecturer Chemistry Test Online.

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

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

Phenobarbital

Barbital

Barbituric acid

Uric acid

2 / 25

In solution, glucose exists as:

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

the cyclic acetal form only

the open-chain form only

the cyclic hemiacetal form only

3 / 25

Which of the following is not a monosaccharide?

Ribose

Sucrose

Glucose

Fructose

4 / 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 is a branched polysaccharide while amylopectin is a chain polysaccharide.

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

5 / 25

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

a slow exchange between hydrogen and deuterated hydrogen

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

a rapid exchange between the D and L forms

a slow change in optical rotation to reach an equilibrium value

6 / 25

An aqueous solution of glucose behaves as an aldehyde because:

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

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

it is hydrolyzed by water to the free aldehyde

glucose is actually a cyclic aldehyde

7 / 25

Which of the following is true about sucrose?

It hydrolyzes to fructose and glucose.

It is a reducing sugar.

It undergoes mutarotation in water.

It is a monosaccharide.

8 / 25

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

monosaccharide

polysaccharide

oligosaccharide

disaccharide

9 / 25

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

amino sugar

imino sugar

deoxy sugar

dehydroxy sugar

10 / 25

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

It is the acetal of a sugar.

It is the enantiomer of a sugar.

It is the mirror image of a sugar.

It is the hemiacetal of a sugar.

11 / 25

Monosaccharides are classified according to :

their configurational relationship to glyceraldehyde.

the number of carbon atoms in the molecule.

all of the above.

whether they contain an aldehyde or a ketone group.

12 / 25

Which is a disaccharide?

Cellulose

Maltose

Fructose

Glucose

13 / 25

The bond angle between carbon atoms in cyclohexane is

90°

109.5°

120°

60°

14 / 25

The most stable conformation of cyclohexane is the :

Boat form

Chair form

Haworth form

Boat form

15 / 25

How many stereoisomers are possible for a 2-ketohexose?

16 / 25

Uric acid on oxidation with alkaline KMnO4 forms :

Allantoin

Urea

Barbituric acid

Caffeine

17 / 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%

over 99%

approximately 50%

18 / 25

Anomers of D-glucopyranose differ in their stereochemistry at

19 / 25

Which is a monosaccharide?

Maltose

Cellulose

Galactose

Sucrose

20 / 25

All chiral D-sugars rotate plane-polarized light :

counterclockwise

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

clockwise

+20.0°

21 / 25

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

methyl β-D-glucopyranoside

methyl α-D-ribofuranoside

sucrose

α-D-glucopyranose

22 / 25

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

23 / 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 length of the carbon chain in the carbohydrate.

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

indicates the direction of rotation of polarized light.

24 / 25

The principal sugar in blood is

Fructose

Sucrose

Glucose

Galactose

25 / 25

Uriedes are

Alkyl derivatives of urea

Halogen derivatives of urea

None of these

Acetyl derivatives of urea

Your score is

The average score is 0%

PPSC Lecturer Chemistry Test 37 Online Preparation MCQs Read More »