PPSC Lecturer Chemistry Syllabus

PPSC Lecturer Chemistry Test 28 Online Preparation MCQs

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There will be 25 multiple choice question in the test.
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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

The melting points of aldehydes and ketones tend to:

decrease with increasing molecular weight.

remain unchanged with increasing molecular weight.

increase with increasing molecular weight.

remain unchanged with increasing molecular weight.

2 / 25

Reduction of acetaldehyde with H2/Ni gives

Ethylene

Acetic acid

Ethane

Ethyl alcohol

3 / 25

Cannizzaro reaction is not given by

Benzaldehyde

Trimethylacetaldehyde

Formaldehyde

Acetaldehyde

4 / 25

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

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Electrophilic addition

5 / 25

The reduction of a ketone

always gives a carboxylic acid

always gives a primary alcohol

always gives a secondary alcohol

always gives a ketal

6 / 25

Ketones are prepared by the oxidation of

Tertiary alcohol

Secondary alcohol

None of these

Primary alcohol

7 / 25

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

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

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

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

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

8 / 25

Cyclopentanol undergoes oxidation to give :

Cyclopentanal

Cyclopentanone

Cyclopentane

Cyclopentene

9 / 25

Which of the following has the lowest boiling point?

CH3CH2CH2SH

CH3CH2CH2OH

CH3CH2OH

HOCH2CH2OH

10 / 25

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

H-bonding between solute molecules.

H-bonding between solute and solvent molecules

Polar interactions between solute molecules.

Van der waals forces

11 / 25

Which statement about the carbonyl group is NOT true?

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

Which statement about the carbonyl group is NOT true?

The carbonyl group forms resonance structures.

12 / 25

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

Wolf-Kishner reduction

Clemmensen reduction

Rosenmund reduction

Reformatsky reaction

13 / 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

14 / 25

Which of the following will have the highest boiling point?

Butanone

2-Pentanone

Propanone

2-Hexanone

15 / 25

Formalin is

20% solution of formaldehyde in water

10% solution of formaldehyde in water

80% solution of formaldehyde in water

40% solution of formaldehyde in water

16 / 25

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

Aldol condensation

Cannizzaro reaction

Hydrolysis

Wurtz reaction

17 / 25

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

Butanal

Propanal

Butanone

Propanone

18 / 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.

I and III

I, III, and IV

II and IV

I, II, and III

19 / 25

The carbon atom of a carbonyl group is

sp3 hybridized

sp2 hybridized

None of these

sp hybridized

20 / 25

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

Hemiketal

Ketal

Hemiacetal

Acetal

21 / 25

Which of the following will have the highest boiling point?

Butanal

Ethanal

Propanal

Methanal

22 / 25

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

Schiff's reagent

Tollens' reagent

Fehling's reagent

Grignard reagent

23 / 25

n-Butyl bromide reacts with NaSH to give

CH3CH2CH2CH2SH

CH3CH2CH2SH

CH3CH2SCH2CH3

CH3SCH3

24 / 25

Which of the following is least soluble in water?

CH3SH

HOCH2CH2OH

CH3CH2OH

CH3OH

25 / 25

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

About the same

Lower than

Higher than

Your score is

The average score is 0%

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