Organic Chemistry Quizzes: Master the Fundamentals of Organic Compounds

Question 1

Which of the following compounds has the same molecular formula as butane (C4H10) but a different structure?

Accepted Answer

2-Methylpropane (C4H10)

Answer

Ethane (C2H6)

Answer

Propane (C3H8)

Answer

Pentane (C5H12)

Question 2

What is the hybridization of the nitrogen atom in ammonia?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 3

What type of reaction occurs when hydrogen reacts with an alkene in the presence of a catalyst?

Accepted Answer

Addition

Answer

Substitution

Answer

Elimination

Answer

Oxidation

Question 4

Which functional group is present in ketones?

Accepted Answer

-C=O

Answer

-OH

Answer

-COOH

Answer

-CHO

Question 5

What is the major product of the following reaction: CH3CH2CH2OH + PBr3?

Accepted Answer

CH3CH2CH2Br

Answer

CH3CH=CHBr

Answer

CH3CHBrCH3

Answer

CH2=CHCH2Br

Question 6

What is the bond angle around the carbon atom in a tetrahedral molecule like methane?

Accepted Answer

109.5°

Answer

90°

Answer

120°

Answer

180°

Question 7

The reaction of an alkene with hydrogen is known as:

Accepted Answer

addition

Answer

elimination

Answer

substitution

Answer

polymerization

Question 8

What is the hybridization of the carbon atoms in benzene?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 9

The major product of the reaction between propene and hydrogen bromide is:

Accepted Answer

1-bromopropane

Answer

2-bromopropane

Answer

bromopropene

Answer

1,2-dibromopropane

Question 10

Which of the following is NOT a method for preparing alkanes?

Accepted Answer

dehydration of alkenes

Answer

hydrogenation of alkenes

Answer

hydrolysis of alkyl halides

Answer

decarboxylation of carboxylic acids

Question 11

Which type of intermolecular force is strongest in compounds containing hydrogen atoms bonded to highly electronegative atoms (such as oxygen, nitrogen, or fluorine)?

Accepted Answer

hydrogen bonding

Answer

dipole-dipole forces

Answer

London dispersion forces

Answer

ion-dipole forces

Question 12

Identify the organic compound from the following options:

Accepted Answer

Methane

Answer

Sodium chloride

Answer

Water

Question 13

The functional group found in alcohols is:

Accepted Answer

-OH

Answer

Carbonyl

Answer

Amine

Answer

Carboxylic acid

Question 14

A structural isomer of butane is:

Accepted Answer

Isobutane

Answer

Propane

Answer

Ethane

Answer

Methane

Question 15

The strongest acid among the following is:

Accepted Answer

Benzoic acid

Answer

Acetic acid

Answer

Phenol

Answer

Ethanol

Question 16

A characteristic of alkanes is that they are:

Accepted Answer

Saturated hydrocarbons

Answer

Contain at least one carbon-carbon double bond

Answer

Contain a functional group

Answer

Highly reactive

Question 17

The hybridization of the carbon atom in the carbonyl group of an aldehyde is:

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 18

A polar solvent is:

Accepted Answer

Water

Answer

Hexane

Answer

Methane

Answer

Carbon dioxide

Question 19

The reaction in which an alcohol is converted to an alkene by heating it with concentrated sulfuric acid is called:

Accepted Answer

Dehydration

Answer

Esterification

Answer

Oxidation

Answer

Reduction

Question 20

What is the IUPAC name for the compound with the molecular formula CH3CH2CH2OH?

Accepted Answer

1-Propanol

Answer

Propanol

Answer

2-Propanol

Answer

Propyl alcohol

Question 21

What is the hybridization of the carbon atoms in the C=C double bond?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 22

What is the mechanism of the SN2 reaction?

Accepted Answer

Nucleophilic attack on the electrophile

Answer

Electrophilic attack on the nucleophile

Answer

Radical attack on the substrate

Answer

Pericyclic reaction

Question 23

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

Accepted Answer

It decreases the activation energy of the reaction.

Answer

It increases the activation energy of the reaction.

Answer

It provides an alternative pathway for the reaction.

Answer

It consumes the reactants.

Question 24

Which of the following compounds has the highest boiling point?

Accepted Answer

Butane

Answer

Methane

Answer

Ethane

Answer

Propane

Question 25

Which of the following reactions is an addition reaction?

Accepted Answer

CH3CH=CH2 + Br2 → CH2BrCHBrCH3

Answer

CH3CH2OH + HCl → CH3CH2Cl + H2O

Question 26

Which of the following is a primary alcohol?

Accepted Answer

CH3CH2OH

Answer

(CH3)2CHOH

Answer

CH3CH(OH)CH2CH3

Answer

PhCH2OH

Question 27

Which of the following is the major product of the reaction between CH3CH=CH2 and Br2?

Accepted Answer

1,2-dibromoethane

Answer

1,1-dibromoethane

Answer

2,3-dibromopropene

Answer

1,2-dibromopropene

Question 28

Which of the following is a condensation reaction?

Accepted Answer

2CH3COOH → (CH3CO)2O + H2O

Answer

CH3CH2OH + HCl → CH3CH2Cl + H2O

Question 29

Which of the following is a tertiary amine?

Accepted Answer

(CH3)3N

Answer

(CH3)2NH

Answer

CH3NH2

Question 30

Which of the following is NOT a functional group found in organic compounds?

Accepted Answer

Sodium ion

Answer

Alcohol

Answer

Ketone

Answer

Ether

Question 31

Which of the following reactions is classified as a nucleophilic addition reaction?

Accepted Answer

SN2

Answer

E2

Answer

SN1

Answer

E1

Question 32

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

Accepted Answer

CH3CH2OH

Answer

CH3CH2Na

Answer

CH2=CH2

Answer

NaBr

Question 33

Which of the following compounds is the most acidic?

Accepted Answer

CH3COOH

Answer

CH3CH2OH

Answer

CH3NH2

Answer

CH3CHO

Question 34

What is the major product of the following reaction: Benzene + HNO3 + H2SO4 → ?

Accepted Answer

Nitrobenzene

Answer

Phenol

Answer

Benzoic acid

Answer

Aniline

Question 35

Which functional group has the highest priority based on IUPAC rules for assigning substituents?

Accepted Answer

Carboxylic acid

Answer

Alcohol

Answer

Aldehyde

Answer

Ketone

Question 36

What type of isomerism is displayed by the compounds butane and 2-methylpropane?

Accepted Answer

Structural isomerism

Answer

Geometric isomerism

Answer

Optical isomerism

Answer

Conformational isomerism

Question 37

Which of the following compounds is classified as an alcohol?

Accepted Answer

CH3CH2OH

Answer

CH3CHO

Answer

CH3COOH

Answer

CH3CH3

Question 38

What is the empirical formula of a compound with the following elemental composition: 40% carbon, 6.67% hydrogen, and 53.33% oxygen?

Accepted Answer

CH2O

Answer

C2H4O

Answer

C3H6O

Answer

C4H8O

Question 39

Which of the following is a primary amine?

Accepted Answer

CH3NH2

Answer

(CH3)2NH

Answer

(CH3)3N

Answer

C6H5NH2

Question 40

Which of the following molecules exhibits resonance?

Accepted Answer

Benzene

Answer

Ethane

Answer

Methane

Answer

Propane

Question 41

Which isomer has the highest boiling point?

Accepted Answer

n-Butane

Answer

Isobutane

Answer

2-Methylpropane

Answer

1-Butene

Question 42

What is the main product of the reaction between ethane and chlorine in the presence of UV light?

Accepted Answer

Ethane dichloride

Answer

Ethene

Answer

Ethanoic acid

Answer

Ethyl chloride

Question 43

Which reaction can be used to prepare an alkene?

Accepted Answer

Dehydration of an alcohol

Answer

Oxidation of an aldehyde

Answer

Reduction of a ketone

Answer

Saponification of an ester

Question 44

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

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 45

Which spectroscopic technique can be used to identify the presence of an alcohol functional group?

Accepted Answer

Infrared spectroscopy

Answer

Mass spectrometry

Answer

Nuclear magnetic resonance spectroscopy

Answer

Ultraviolet-visible spectroscopy

Question 46

What is the major product of the electrophilic aromatic substitution reaction between benzene and nitric acid?

Accepted Answer

Nitrobenzene

Answer

Phenol

Answer

Benzoic acid

Answer

Aniline

Question 47

What is the hybridization of the carbon atoms in the double bond of an alkene?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 48

Which functional group is commonly found in organic compounds and characterized by a carbon-oxygen double bond?

Accepted Answer

Aldehyde

Answer

Amine

Answer

Ester

Answer

Alcohol

Question 49

Determine the IUPAC name for the compound with the molecular formula C2H5OH.

Accepted Answer

Ethanol

Answer

Methanol

Answer

Propanol

Answer

Butanol

Question 50

Which type of isomerism involves compounds with the same molecular formula but different spatial arrangements of atoms?

Accepted Answer

Stereoisomerism

Answer

Structural isomerism

Answer

Conformational isomerism

Answer

Tautomerism

Question 51

Identify the hybridization of the carbon atom in the molecule CH3CH=CH2.

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 52

Which of the following reactions is an example of an electrophilic addition reaction?

Accepted Answer

Addition of HBr to an alkene

Answer

Reaction of an alcohol with a carboxylic acid

Answer

Polymerization of ethene

Answer

Substitution of a halogen with a hydroxyl group

Question 53

Which solvent is commonly used for recrystallization due to its ability to dissolve a solute at high temperatures and precipitate it at low temperatures?

Accepted Answer

Ethanol

Answer

Water

Answer

Hexane

Answer

Dichloromethane

Question 54

The primary purpose of using a condenser in a distillation apparatus is to:

Accepted Answer

Cool and condense vapors

Answer

Prevent vapor loss

Answer

Control the rate of distillation

Answer

Separate liquids with different boiling points

Question 55

Which characteristic property is commonly associated with alkanes?

Accepted Answer

Insoluble in water

Answer

High reactivity

Answer

Low melting point

Answer

Sweet odor

Question 56

In an alcohol functional group, the type of bond formed between carbon and oxygen is a:

Accepted Answer

Covalent bond

Answer

Ionic bond

Answer

Hydrogen bond

Answer

Coordinate bond

Question 57

Which of the following is a functional group that contains a carbon-oxygen double bond (C=O)?

Accepted Answer

Aldehyde

Answer

Electron

Answer

Ion

Answer

Neutron

Question 58

What is the molecular formula of ethene, the simplest alkene?

Accepted Answer

C2H4

Answer

CH2

Answer

C2H6

Answer

C3H8

Question 59

Which of the following is an isomer of butane, a hydrocarbon with the molecular formula C4H10?

Accepted Answer

2-methylpropane

Answer

Ethane

Answer

Propane

Answer

Pentane

Question 60

What is the hybridization of the carbon atom in methane, the simplest hydrocarbon?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 61

What is the product of the following reaction, where methanol (CH3OH) reacts with concentrated sulfuric acid (H2SO4)?

Accepted Answer

CH3CH2Cl

Answer

CH3CH2Br

Answer

CH3CH2I

Answer

CH3CH2F

Question 62

Which of the following is the strongest acid, meaning it donates protons (H+) most readily?

Accepted Answer

CF3COOH (trifluoroacetic acid)

Answer

CH3COOH (acetic acid)

Answer

C2H5COOH (propionic acid)

Answer

HCOOH (formic acid)

Question 63

Which of the following is a polymer, a large molecule composed of repeating structural units?

Accepted Answer

Polyethylene

Answer

Sodium chloride

Answer

Water

Answer

Carbon dioxide

Question 64

Identify the functional group present in the molecule CH3CH2OH:

Accepted Answer

Alcohol

Answer

Carboxylic acid

Answer

Ketone

Answer

Amide