Organic Chemistry Quizzes: Test Your Knowledge

Question 1

Which formula represents the general structure of an alkane?

Accepted Answer

CnH2n+2

Answer

CnH2n

Answer

CnH2n-2

Answer

CnH2n+4

Question 2

Alkenes undergo which type of reaction most readily?

Accepted Answer

Addition

Answer

Substitution

Answer

Oxidation

Answer

Polymerization

Question 3

Identify the functional group present in a carboxylic acid.

Accepted Answer

-COOH

Answer

-OH

Answer

-NH2

Answer

-CHO

Question 4

Identify the isomer of butane.

Accepted Answer

Isobutane

Answer

Pentane

Answer

Propane

Answer

Ethane

Question 5

Which of the following hydrocarbons contains only single bonds?

Accepted Answer

Ethane

Answer

Ethylene

Answer

Butyne

Answer

Propene

Question 6

Which functional group is present in aldehydes?

Accepted Answer

Carbonyl

Answer

Carboxyl

Answer

Ester

Answer

Alkyl

Question 7

Which of the following reactions produces an alkene?

Accepted Answer

Elimination

Answer

Hydrogenation

Answer

Oxidation

Answer

Reduction

Question 8

Which of the following is a key characteristic of carboxylic acids?

Accepted Answer

Weak acidity

Answer

High boiling point

Answer

Solubility in water

Answer

Flammable nature

Question 9

Which of the following reactions involves the removal of water molecules to form a covalent bond between two molecules?

Accepted Answer

Condensation

Answer

Hydrogenation

Answer

Polymerisation

Answer

Addition

Question 10

What is the molecular formula of ethanoic acid?

Accepted Answer

CH3COOH

Answer

C2H5COOH

Answer

CH3CH2COOH

Answer

C2H5CH2COOH

Question 11

Which of the following molecules has a permanent dipole moment?

Accepted Answer

Water

Answer

Ethane

Answer

Methane

Answer

Ethylene

Question 12

What type of reaction occurs between an alcohol and a carboxylic acid in the presence of an acid catalyst?

Accepted Answer

Esterification

Answer

Saponification

Answer

Polymerisation

Answer

Combustion

Question 13

Which property is characteristic of alkanes?

Accepted Answer

Low reactivity

Answer

Low boiling points

Answer

Unsaturation

Answer

Cyclic structure

Question 14

Which reaction is characteristic of aldehydes?

Accepted Answer

Oxidation to a carboxylic acid

Answer

Addition of hydrogen

Answer

Substitution of the carbonyl group

Answer

Polymerisation

Question 15

What is the product of the reaction between a ketone and a Grignard reagent?

Accepted Answer

An alcohol

Answer

An alkene

Answer

An alkyne

Answer

A carboxylic acid

Question 16

Which of the following is a strong organic acid?

Accepted Answer

Methanoic acid

Answer

Ethanol

Answer

Ethanoic acid

Answer

Propanoic acid

Question 17

What is the functional group present in an ester?

Accepted Answer

-COOR

Answer

-COOH

Answer

-CHO

Answer

-OH

Question 18

Which reaction is used to prepare alkenes?

Accepted Answer

Dehydration of alcohols

Answer

Hydrogenation of alkanes

Answer

Hydrolysis of esters

Answer

Oxidation of aldehydes

Question 19

What is the IUPAC name for the compound with the formula: CH₃CH₂CH(CH₃)CH₂CH₃?

Accepted Answer

2-methylpentane

Answer

3-methylpentane

Answer

2,3-dimethylbutane

Answer

3,4-dimethylbutane

Question 20

What is the major product of the following reaction: CH₃CH₂Br + Mg → ?

Accepted Answer

CH₃CH₂MgBr

Answer

CH3CH3

Answer

CH₃CH₂H

Answer

MgBr2

Question 21

Name the following compound according to IUPAC nomenclature rules: CH3CH2CH(CH3)CH2CH3

Accepted Answer

2-methylpentane

Answer

3-methylpentane

Answer

2-ethylbutane

Answer

3-ethylbutane

Question 22

Identify the compound with the functional group of a ketone:

Accepted Answer

CH3COCH3

Answer

CH3CH2OH

Answer

CH3COOH

Answer

CH3CH2CH=O

Question 23

Which of the following reactions can be used to synthesize an ester?

Accepted Answer

Alcoholysis of an acid chloride

Answer

Hydrolysis of an ester

Answer

Oxidation of an aldehyde

Answer

Reduction of a ketone

Question 24

Describe the primary function of a catalyst in an organic reaction:

Accepted Answer

To decrease the activation energy of the reaction

Answer

To increase the reaction rate

Answer

To change the products of the reaction

Answer

To prevent the reaction from occurring

Question 25

Determine the hybridization of the carbon atom participating in a double bond:

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 26

Which of these reactions is classified as an addition reaction?

Accepted Answer

Addition of hydrogen across a carbon-carbon double bond

Answer

Combustion of methane

Answer

Substitution of a hydrogen atom in methane with a chlorine atom

Answer

Polymerisation of ethene

Question 27

In the presence of a catalyst, what is the major product formed from the reaction between ethanol and ethanoic acid?

Accepted Answer

Ethyl ethanoate

Answer

Ethanoic acid

Answer

Water

Answer

Acetaldehyde

Question 28

What is the hybridization of the carbon atom present in the carbonyl group of an aldehyde?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 29

Identify the correct isomer of butane:

Accepted Answer

2-methylpropane

Answer

Ethene

Answer

Propane

Answer

Ethanoic acid

Question 30

Which of the following substances functions as a reducing agent?

Accepted Answer

Sodium

Answer

Potassium permanganate

Answer

Hydrochloric acid

Answer

Oxygen

Question 31

Which of the following compounds is an alkane, meaning it contains only single C-C bonds and only carbon and hydrogen atoms?

Accepted Answer

CH₄

Answer

C₂H₄

Answer

CH₃OH

Answer

CH₃COOH

Question 32

Which of the following reagents can be used to oxidize a primary alcohol (RCH₂OH) to an aldehyde (RCHO)?

Accepted Answer

KMnO₄

Answer

NaBH₄

Answer

H₂SO₄

Answer

NaOH

Question 33

What is the name of the functional group present in carboxylic acids, which gives them their acidic properties?

Accepted Answer

-COOH

Answer

-OH

Answer

-CHO

Answer

-C=O

Question 34

Which of the following compounds is an ester, characterized by the presence of an -COOR functional group?

Accepted Answer

CH₃COOCH₃

Answer

CH₃CH₂OH

Answer

CH₃COOH

Answer

CH₃NH₂

Question 35

Which of the following reactions involves the formation of an ester by combining a carboxylic acid and an alcohol?

Accepted Answer

Carboxylic acid and alcohol

Answer

Ketone and amine

Answer

Ester and water

Answer

Aldehyde and alcohol

Question 36

When an alkene reacts with hydrogen in the presence of a catalyst, what is the major product formed?

Accepted Answer

Alkane

Answer

Alkene

Answer

Alkene dimer

Answer

Alkyne

Question 37

Which of the following compounds is a ketone?

Accepted Answer

Propanone

Answer

Ethanol

Answer

Ethanoic acid

Answer

Butane

Question 38

Which of the following reactions is used to prepare esters?

Accepted Answer

Esterification

Answer

Saponification

Answer

Neutralization

Answer

Polymerization

Question 39

Which of the following functional groups is present in both aldehydes and ketones?

Accepted Answer

C=O

Answer

-OH

Answer

-COOH

Answer

-NH2

Question 40

Which of the following compounds is an isomer of butane?

Accepted Answer

2-methylpropane

Answer

Ethene

Answer

Propene

Answer

1-butanol

Question 41

What is the general formula for alkanes, the simplest class of hydrocarbons?

Accepted Answer

CnH2n+2

Answer

CnH2n

Answer

CnH2n-2

Answer

C_n+1H_2n+1

Question 42

Which of the following reactions is an addition reaction, involving the direct addition of atoms or molecules to a multiple bond?

Accepted Answer

Hydrogenation of ethene

Answer

Combustion of methane

Answer

Saponification of an ester

Answer

Substitution of an alkyl halide

Question 43

Which of the following polymers is biodegradable, meaning it can be broken down by natural processes?

Accepted Answer

Polylactic acid

Answer

Polyethylene

Answer

Polystyrene

Answer

Polyvinyl chloride

Question 44

In which functional group is a carbonyl group bonded to a hydrogen atom?

Accepted Answer

Aldehyde

Answer

Ketone

Answer

Carboxylic acid

Answer

Ester

Question 45

Which of the following is NOT a characteristic reaction of alkenes?

Accepted Answer

Hydrolysis

Answer

Addition

Answer

Substitution

Answer

Elimination

Question 46

Identify the ester in the following options:

Accepted Answer

CH3COOCH3

Answer

CH3CH2OH

Answer

C6H5COOH

Answer

CH3NH2

Question 47

What is the major product formed when an aldehyde reacts with a primary alcohol?

Accepted Answer

Acetal

Answer

Ketone

Answer

Ether

Answer

Carboxylic acid

Question 48

Which reagent can be used to oxidize primary alcohols to aldehydes?

Accepted Answer

KMnO4

Answer

NaBH4

Answer

H2/Pt

Answer

LiAlH4

Question 49

Which of the following compounds is a saturated hydrocarbon?

Accepted Answer

CH4

Answer

CH2=CH2

Answer

CH3CH2OH

Answer

CH3COOH

Question 50

Which of the following compounds is an alkane?

Accepted Answer

Propane

Answer

Ethene

Answer

Ethanol

Answer

Butanal

Question 51

What functional group is present in an aldehyde?

Accepted Answer

-CHO

Answer

-COOH

Answer

-OH

Answer

-NH2