Organic Chemistry Quizzes for Year 11 Science Students

Question 1

Which functional group is characteristic of alcohols?

Accepted Answer

Hydroxyl (-OH)

Answer

Aldehyde

Answer

Ketone

Answer

Carboxylic acid

Question 2

The reaction of ethene with hydrogen results in the formation of:

Accepted Answer

Ethane

Answer

Ethanoic acid

Answer

Ethyne

Answer

Ethanol

Question 3

Which of the following substances is classified as a polymer?

Accepted Answer

Polythene

Answer

Methane

Answer

Water

Answer

Carbon dioxide

Question 4

A characteristic feature of organic compounds is:

Accepted Answer

Covalent bonding

Answer

High solubility in water

Answer

High melting points

Answer

Low flammability

Question 5

The hybridization of the carbon atom in methane is:

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 6

Which of the following reactions involves the breaking of a carbon-carbon (C-C) bond?

Accepted Answer

Combustion

Answer

Esterification

Answer

Polymerisation

Answer

Alkylation

Question 7

Which of the provided compounds has the highest boiling point?

Accepted Answer

C4H10

Answer

CH4

Answer

C2H6

Answer

C3H8

Question 8

Which type of hybridisation is present in the carbon atom of an alkene?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 9

Which of the following is classified as a biodegradable polymer?

Accepted Answer

Polylactic acid

Answer

Polyethylene

Answer

Polystyrene

Answer

Polyvinyl chloride

Question 10

Which of the given compounds is considered chiral?

Accepted Answer

CH3CH(OH)CH3

Answer

CH3CH2OH

Answer

CH3CH2CH3

Answer

CH3CH2COOH

Question 11

What is the role of a catalyst in an organic chemical reaction?

Accepted Answer

To decrease the activation energy of the reaction.

Answer

To increase the activation energy of the reaction.

Answer

To change the products of the reaction.

Answer

To increase the rate of the reaction.

Question 12

What is the primary product of the dehydration of an alcohol?

Accepted Answer

An alkene

Answer

An ether

Answer

An aldehyde

Answer

A ketone

Question 13

What is the hybridization of the carbon atoms in ethane (C2H6)?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 14

Which of the following is an example of a condensation reaction?

Accepted Answer

Polymerization: 2CH3COOH → (CH3CO)2O + H2O

Answer

Esterification: CH3OH + HCl → CH3Cl + H2O

Answer

Substitution: CH3CH2Br + NaOH → CH3CH2OH + NaBr

Answer

Hydrogenation: CH3CH=CH2 + H2 → CH3CH2CH3

Question 15

Which functional group is characteristic of alcohols?

Accepted Answer

-OH

Answer

-COOH

Answer

-CHO

Answer

-NH2

Question 16

Which type of reaction is employed to synthesize esters?

Accepted Answer

Esterification

Answer

Neutralization

Answer

Polymerization

Answer

Condensation

Question 17

What is the hybridization of the carbon atom in the carbonyl group of aldehydes?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 18

Which physical property is characteristic of alkenes?

Accepted Answer

Low boiling point

Answer

High density

Answer

Solubility in water

Answer

High melting point

Question 19

Which functional group is responsible for the characteristic reactions of aldehydes?

Accepted Answer

-CHO

Answer

-COOH

Answer

-OH

Answer

-NH2

Question 20

What type of hybridization is exhibited by the carbon atoms in a benzene ring?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 21

Which characteristic distinguishes organic molecules?

Accepted Answer

Presence of carbon and hydrogen atoms

Answer

High solubility in water

Answer

Elevated melting and boiling points

Answer

Resistance to flammability

Question 22

Identify the functional group present in the molecule CH3COOH.

Accepted Answer

Carboxylic acid

Answer

Alcohol

Answer

Ketone

Answer

Aldehyde

Question 23

In which type of reaction does a nucleophile replace a leaving group?

Accepted Answer

Nucleophilic substitution

Answer

Electrophilic addition

Answer

Nucleophilic addition

Answer

Elimination

Question 24

Classify the following substance: Polyethylene

Accepted Answer

Polymer

Answer

Salt

Answer

Elemental compound

Answer

Gas

Question 25

Which of the following accurately describes benzene?

Accepted Answer

An aromatic hydrocarbon

Answer

A saturated hydrocarbon

Answer

A hydrocarbon containing only double bonds

Answer

A water-soluble hydrocarbon

Question 26

What is the product of the reaction between an alcohol and a carboxylic acid?

Accepted Answer

Ester

Answer

Ether

Answer

Amide

Answer

Ketone

Question 27

Which of the following compounds has the highest boiling point?

Accepted Answer

Hexane

Answer

Pentane

Answer

Butane

Answer

Propane

Question 28

What is the hybridization of the carbon atom in methane?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 29

What is the IUPAC name for the following compound: CH3-CH(CH3)-CH2-CH3?

Accepted Answer

2-Methylbutane

Answer

3-Methylbutane

Answer

2,2-Dimethylpropane

Answer

2-Ethylpropane

Question 30

Which of the following reactions can be used to prepare alkenes?

Accepted Answer

Dehydration

Answer

Hydrogenation

Answer

Hydrolysis

Answer

Oxidation

Question 31

How do functional groups impact the chemical properties and reactivity of organic molecules?

Accepted Answer

They determine the characteristic chemical properties of organic molecules.

Answer

They have no effect on the chemical properties of organic molecules.

Answer

They only affect the solubility of organic molecules in water.

Answer

They are the sole factor determining the boiling point of organic molecules.

Question 32

Define the term **isomerism** and provide an example.

Accepted Answer

Isomerism is the phenomenon where compounds with the same molecular formula have different structural formulas. An example is butane (C4H10), which has two isomers: n-butane and isobutane.

Answer

Isomerism is the phenomenon where compounds with the same molecular formula have different physical properties.

Answer

Isomerism is the phenomenon where compounds with different molecular formulas have the same structural formula.

Answer

Isomerism is the phenomenon where compounds with different molecular formulas have different chemical properties.

Question 33

Which of the following is a characteristic of **alkanes**?

Accepted Answer

They are saturated hydrocarbons.

Answer

They are highly reactive.

Answer

They contain at least one double bond.

Answer

They are soluble in water.

Question 34

What is the product of the **combustion** of methane (CH4)?

Accepted Answer

Carbon dioxide (CO2) and water (H2O)

Answer

Carbon dioxide (CO2) and hydrogen (H2)

Answer

Carbon monoxide (CO) and hydrogen (H2)

Answer

Carbon monoxide (CO) and water (H2O)

Question 35

Which of the following is a biomolecule that can be found in living organisms?

Accepted Answer

Protein

Answer

Sodium chloride

Answer

Carbon dioxide

Answer

Water

Question 36

Which of the following compounds is an isomer of butane, having the same molecular formula but a different structural arrangement?

Accepted Answer

2-Methylpropane

Answer

Propane

Answer

Ethane

Answer

Methane

Question 37

Determine the hybridization of the carbon atom in the carbonyl group (C=O) of an aldehyde?

Accepted Answer

sp2

Answer

sp3d

Answer

sp

Answer

sp3

Question 38

Which of the following compounds has the highest boiling point due to stronger intermolecular forces?

Accepted Answer

Octane

Answer

Butane

Answer

Ethane

Answer

Methane

Question 39

Which of the following is a defining characteristic of organic compounds that distinguishes them from inorganic compounds?

Accepted Answer

They contain carbon

Answer

They are soluble in water

Answer

They are highly reactive

Answer

They are all gases

Question 40

Identify the characteristic of organic molecules:

Accepted Answer

Contain carbon atoms

Answer

Exist solely as gases

Answer

Exist exclusively as solids

Answer

Exhibit universal solubility in water

Question 41

Provide the IUPAC name for the compound: CH3CH2CHBrCH3

Accepted Answer

1-Bromobutane

Answer

2-Chlorobutane

Answer

2-Bromobutane

Answer

1-Chlorobutane

Question 42

Identify the functional group present in alcohols:

Accepted Answer

-OH

Answer

-NH2

Answer

-COOH

Question 43

Classify the following reaction type: CH3CH2Br + NaOH → CH3CH2OH + NaBr

Accepted Answer

Nucleophilic substitution

Answer

Elimination

Answer

Addition

Question 44

Predict the major product of the dehydration of 2-methyl-2-propanol:

Accepted Answer

2-methylpropene

Answer

1-methylpropene

Answer

2-methyl-1-propene

Answer

1-methyl-2-propene

Question 45

Determine the hybridization of the carbon atom in the C=C bond of ethene:

Accepted Answer

sp2

Answer

sp

Answer

sp3d

Answer

sp3

Question 46

Identify the compound that exhibits cis-trans isomerism:

Accepted Answer

1,2-dichloroethene

Answer

propene

Answer

ethene

Answer

2-methylpropane

Question 47

Identify the reaction that produces an alkene:

Accepted Answer

Dehydration of an alcohol

Answer

Oxidation of an alcohol

Answer

Hydrolysis of an ester

Answer

Addition of hydrogen to an alkene

Question 48

What type of reaction occurs between an alcohol and a carboxylic acid?

Accepted Answer

Esterification

Answer

Neutralization

Answer

Substitution

Question 49

Which of the following is an alkene?

Accepted Answer

CH2=CH2

Answer

NH3

Answer

CH3CH2OH

Answer

CH3COOH

Question 50

What is the IUPAC name for the compound CH3CH=CHCH3?

Accepted Answer

But-2-ene

Answer

Propene

Answer

Ethene

Question 51

Which reaction method is used to prepare alkenes from alkyl halides?

Accepted Answer

Dehydrohalogenation

Answer

Hydrolysis

Answer

Oxidation

Question 52

What is the hybridization of the carbon atom in the C=C bond of an alkene?

Accepted Answer

sp2

Answer

sp3d

Answer

sp

Answer

sp3

Question 53

Which compound is an aromatic hydrocarbon?

Accepted Answer

Benzene

Answer

Propane

Answer

Ethane

Answer

Cyclohexane

Question 54

What type of reaction occurs between an aromatic hydrocarbon and an electrophile?

Accepted Answer

Electrophilic aromatic substitution

Answer

Elimination

Answer

Free radical substitution

Answer

Nucleophilic addition

Question 55

Which of the following is a major natural source of organic compounds?

Accepted Answer

Petroleum

Answer

Water

Answer

Granite

Answer

Sand

Question 56

What is the primary component of natural gas?

Accepted Answer

Methane

Answer

Ethane

Answer

Propane

Answer

Butane