Lecturer Chemistry MCQs

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

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

Higher than

About the same

Lower than

2 / 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, II, and III

I, III, and IV

II and IV

3 / 25

The reduction of a ketone

always gives a carboxylic acid

always gives a ketal

always gives a primary alcohol

always gives a secondary alcohol

4 / 25

Which of the following has the lowest boiling point?

HOCH2CH2OH

CH3CH2OH

CH3CH2CH2OH

CH3CH2CH2SH

5 / 25

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

Butanone

Propanone

Propanal

Butanal

6 / 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.

7 / 25

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

Reformatsky reaction

Wolf-Kishner reduction

Rosenmund reduction

Clemmensen reduction

8 / 25

Ketones are prepared by the oxidation of

Secondary alcohol

Tertiary alcohol

Primary alcohol

None of these

9 / 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.

10 / 25

Which of the following will have the highest boiling point?

Methanal

Propanal

Butanal

Ethanal

11 / 25

Which of the following is least soluble in water?

CH3CH2OH

HOCH2CH2OH

CH3OH

CH3SH

12 / 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

Van der waals forces

Polar interactions between solute molecules.

13 / 25

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

Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

14 / 25

Which of the following will have the highest boiling point?

2-Hexanone

2-Pentanone

Butanone

Propanone

15 / 25

Cyclopentanol undergoes oxidation to give :

Cyclopentane

Cyclopentene

Cyclopentanone

Cyclopentanal

16 / 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 oxygen to form H-bonds with other carbonyl groups.

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

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

17 / 25

Formalin is

10% solution of formaldehyde in water

20% solution of formaldehyde in water

80% solution of formaldehyde in water

40% solution of formaldehyde in water

18 / 25

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

Grignard reagent

Tollens' reagent

Fehling's reagent

Schiff's reagent

19 / 25

n-Butyl bromide reacts with NaSH to give

CH3SCH3

CH3CH2SCH2CH3

CH3CH2CH2CH2SH

CH3CH2CH2SH

20 / 25

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

Aldol condensation

Wurtz reaction

Cannizzaro reaction

Hydrolysis

21 / 25

Reduction of acetaldehyde with H2/Ni gives

Ethane

Ethylene

Acetic acid

Ethyl alcohol

22 / 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

23 / 25

Cannizzaro reaction is not given by

Formaldehyde

Benzaldehyde

Trimethylacetaldehyde

Acetaldehyde

24 / 25

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

Hemiketal

Acetal

Ketal

Hemiacetal

25 / 25

The carbon atom of a carbonyl group is

sp3 hybridized

sp2 hybridized

None of these

sp hybridized

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