PPSC Lecturer Chemistry Test 28 Online Preparation MCQs

Leave a Comment / By Hassan / May 20, 2021

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 28
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. 28

1 / 25

Reduction of acetaldehyde with H2/Ni gives

Ethyl alcohol

Acetic acid

Ethane

Ethylene

2 / 25

Which of the following will have the highest boiling point?

2-Pentanone

Butanone

Propanone

2-Hexanone

3 / 25

What property of low-molecular weight aldehydes and ketones accounts for the magnitude of their boiling points?

The ability of the carbonyl oxygen to form H-bonds with other carbonyl groups.

The ability to form strong H-bonds between their molecules.

The ability of the carbonyl group to attract electrophiles and form bonds.

The ability of the polar carbonyl group to attract other polar molecules.

4 / 25

Acetone undergoes reduction with zinc amalgam in HCl to form propane. This reaction is known as

Clemmensen reduction

Aldol condensation

Wolf-Kishner reduction

Rosenmund reduction

5 / 25

When formaldehyde is treated with 50% NaOH solution, it undergoes

Hydrolysis

Aldol condensation

Cannizzaro reaction

Wurtz reaction

6 / 25

The carbon atom of a carbonyl group is

None of these

sp2 hybridized

sp hybridized

sp3 hybridized

7 / 25

Acetone undergoes reduction with hydrazine in the presence of NaOH to form propane. This reaction is known as

Wolf-Kishner reduction

Reformatsky reaction

Rosenmund reduction

Clemmensen reduction

8 / 25

On reduction with LiAlH4, which of the following compounds could yield an optically active compound?

Butanal

Butanone

Propanal

Propanone

9 / 25

The reaction of ethanal with one equivalent of methanol and a trace of an acid will give

Ketal

Hemiacetal

Hemiketal

Acetal

10 / 25

Which of the following reagents will react readily with both aldehydes and ketones?

Fehling's reagent

Schiff's reagent

Tollens' reagent

Grignard reagent

11 / 25

Primary alcohols have boiling points that are _____________ the corresponding aldehydes.

Lower than

About the same

Higher than

12 / 25

n-Butyl bromide reacts with NaSH to give

CH3CH2SCH2CH3

CH3SCH3

CH3CH2CH2SH

CH3CH2CH2CH2SH

13 / 25

The reduction of a ketone

always gives a secondary alcohol

always gives a carboxylic acid

always gives a ketal

always gives a primary alcohol

14 / 25

Formalin is

40% solution of formaldehyde in water

80% solution of formaldehyde in water

10% solution of formaldehyde in water

20% solution of formaldehyde in water

15 / 25

The melting points of aldehydes and ketones tend to:

remain unchanged with increasing molecular weight.

decrease with increasing molecular weight.

increase with increasing molecular weight.

16 / 25

Which statement about the carbonyl group is NOT true?

Which statement about the carbonyl group is NOT true?

The carbonyl group forms resonance structures.

The three atoms attached to the carbonyl carbon form a nonplanar geometry.

17 / 25

Cyclopentanol undergoes oxidation to give :

Cyclopentanone

Cyclopentene

Cyclopentane

Cyclopentanal

18 / 25

Which of the following is least soluble in water?

CH3CH2OH

HOCH2CH2OH

CH3SH

CH3OH

19 / 25

Which of the following will have the highest boiling point?

Methanal

Ethanal

Propanal

Butanal

20 / 25

Acetone reacts with HCN to form a cyanohydrin. It is an example of

Electrophilic substitution

Nucleophilic substitution

Nucleophilic addition

Electrophilic addition

21 / 25

Which statement about the carbonyl group of ketones and aldehydes is true?
I. It can attract nucleophiles.
II. It can attract electrophiles.
III. It tends to undergo addition reactions.
IV. It tends to undergo substitution reactions.

II and IV

I, II, and III

I and III

I, III, and IV

22 / 25

Which action best accounts for the solubility of aldehydes and ketones in water?

Van der waals forces

Polar interactions between solute molecules.

H-bonding between solute molecules.

H-bonding between solute and solvent molecules

23 / 25

Which of the following has the lowest boiling point?

CH3CH2CH2OH

CH3CH2CH2SH

HOCH2CH2OH

CH3CH2OH

24 / 25

Ketones are prepared by the oxidation of

Secondary alcohol

Tertiary alcohol

Primary alcohol

None of these

25 / 25

Cannizzaro reaction is not given by

Benzaldehyde

Trimethylacetaldehyde

Formaldehyde

Acetaldehyde

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