Organic Chemistry Quizzes: Test Your Knowledge and Skills

Question 1

Which compound is not an isomer of butane?

Accepted Answer

1-butene

Answer

2-methylpropane

Answer

2,2-dimethylpropane

Answer

cyclobutane

Question 2

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

Accepted Answer

Benzene

Answer

Alcohol

Answer

Ether

Answer

Ketone

Question 3

Which of the following is NOT a type of isomerism in organic chemistry?

Accepted Answer

Resonance isomerism

Answer

Structural isomerism

Answer

Geometric isomerism

Answer

Tautomerism

Question 4

In IUPAC nomenclature, which functional group has the highest priority?

Accepted Answer

Carboxylic acid

Answer

Alcohol

Answer

Ketone

Answer

Alkene

Question 5

What functional group is unique to alcohols?

Accepted Answer

Hydroxyl group

Answer

Carbonyl group

Answer

Amino group

Answer

Carboxyl group

Question 6

What functional group is characteristic of ester compounds?

Accepted Answer

Ester (-COOR)

Answer

Alcohol (-OH)

Answer

Carboxylic acid (-COOH)

Answer

Aldehyde (-CHO)

Question 7

Which compound is not an alkane?

Accepted Answer

Ethene

Answer

Propane

Answer

Butane

Answer

Methane

Question 8

What is a characteristic property of primary alcohols?

Accepted Answer

They can be oxidized to aldehydes.

Answer

They have a strong, pungent odor.

Answer

They are insoluble in water.

Answer

They are less reactive than secondary and tertiary alcohols.

Question 9

Which functional group is unique to alcohol molecules?

Accepted Answer

Hydroxyl group (OH)

Answer

Carbonyl group (C=O)

Answer

Carboxyl group (COOH)

Answer

Amino group (NH2)

Question 10

Determine the IUPAC name for the following compound:

Accepted Answer

1-chloro-2-methylpropane

Answer

2-chloro-1-methylpropane

Answer

3-chloro-2-methylpropane

Question 11

Which spectroscopic technique in organic chemistry uses infrared radiation absorption to reveal the molecular structure of compounds?

Accepted Answer

Infrared (IR) spectroscopy

Answer

Nuclear Magnetic Resonance (NMR) spectroscopy

Answer

Mass spectrometry

Question 12

Which reaction showcases the typical characteristics of an organic compound?

Accepted Answer

Methane undergoing combustion

Answer

Sodium reacting with water

Question 13

Identify the compound that does not contain a functional group:

Accepted Answer

Methane

Answer

Alcohol

Answer

Ether

Answer

Ketone

Question 14

Which compound has a triple bond in its structure?

Accepted Answer

Butyne

Answer

Ethane

Answer

Propene

Answer

Benzene

Question 15

Which functional group characterizes an aldehyde?

Accepted Answer

Carbonyl group (-CO-)

Answer

Alcohol group (-OH)

Answer

Carboxyl group (-COOH)

Question 16

Which functional group differentiates alcohols from other organic compounds?

Accepted Answer

Hydroxyl group (-OH)

Answer

Carbonyl group (C=O)

Answer

Amino group (NH2)

Answer

Carboxyl group (COOH)

Question 17

What is the hybridization of the carbon atoms in an alkyne?

Accepted Answer

sp

Answer

sp2

Answer

sp3

Answer

sp3d

Question 18

Identify the aromatic hydrocarbon with the formula C6H5CH3.

Accepted Answer

Toluene

Answer

Benzene

Answer

Ethylbenzene

Answer

Xylene

Question 19

What is the primary role of enzymes in organic reactions?

Accepted Answer

Accelerating reactions

Answer

Providing energy for reactions

Answer

Changing the direction of reactions

Answer

Creating new reactants

Question 20

Identify the secondary alcohol.

Accepted Answer

(CH3)2CHOH

Answer

CH3OH

Answer

CH3CH2OH

Answer

(CH3)3COH

Question 21

Determine the product of the reaction between an alkene and hydrogen bromide.

Accepted Answer

Alkyl bromide

Answer

Alkyl halide

Answer

Alkyl radical

Answer

Alkyl carbocation

Question 22

Define a resonance structure.

Accepted Answer

A chemical structure that represents the delocalization of electrons

Answer

A Lewis structure that shows all valence electrons

Answer

A molecular orbital diagram

Answer

A three-dimensional representation of a molecule

Question 23

Determine the bond angle around the carbon atom in methane (CH4).

Accepted Answer

109.5 degrees

Answer

90 degrees

Answer

120 degrees

Answer

180 degrees

Question 24

The IUPAC name for the compound CH3CH(CH3)CH2CH2CH3 is:

Accepted Answer

2-methylpentane

Answer

3-methylpentane

Answer

4-methylpentane

Answer

2-ethylbutane

Question 25

Which functional group characterizes ethene (C2H4)?

Accepted Answer

Alkene

Answer

Alkyne

Answer

Alcohol

Answer

Aldehyde

Question 26

Alkenes undergo which type of reaction:

Accepted Answer

Addition

Answer

Substitution

Answer

Elimination

Answer

Oxidation

Question 27

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

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 28

Which compound is an isomer of benzene?

Accepted Answer

Cyclohexane

Answer

Toluene

Answer

Ethylene

Answer

Propane

Question 29

What is the product of the reaction: CH3CH=CH2 + H2O?

Accepted Answer

CH3CH2CH2OH

Answer

CH3CHO

Answer

CH3COCH3

Answer

CH3COOH

Question 30

Which reagent oxidizes alkenes to diols?

Accepted Answer

KMnO4

Answer

NaBH4

Answer

H2SO4

Answer

NaOH

Question 31

The major product of the reaction: CH3CH=CH2 + Br2 is:

Accepted Answer

CH3CHBrCH2Br

Answer

CH3CH=CHBr

Answer

CH2BrCH=CH2

Answer

CH3CH2CH2Br

Question 32

Which compound is a resonance contributor to benzene?

Accepted Answer

Cyclohexadiene

Answer

Hexane

Answer

Cyclohexane

Answer

1,3-Butadiene

Question 33

What is the hybridization of the nitrogen atom in pyridine?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 34

Which of the following is NOT an alkane?

Accepted Answer

Ethene

Answer

Ethane

Answer

Propane

Answer

Butane

Question 35

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 36

Which of the following is an aromatic compound?

Accepted Answer

Benzene

Answer

Ethane

Answer

Propene

Answer

Butane

Question 37

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

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d2

Question 38

What is the major product of the following reaction: benzene + sulfuric acid?

Accepted Answer

Benzenesulfonic acid

Answer

Dibromobenzene

Answer

Tribromobenzene

Answer

Benzene dibromide

Question 39

Which of the following functional groups is present in an aldehyde?

Accepted Answer

-C=O

Answer

-OH

Answer

-COOH

Answer

-NH2

Question 40

What is the IUPAC name for the compound with the molecular formula CH3CH2CH(CH3)2?

Accepted Answer

2-methylbutane

Answer

2-methyl-2-propanol

Answer

3-methylbutane

Answer

2,2-dimethylpropane

Question 41

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

Accepted Answer

sp²

Answer

sp

Answer

sp³

Answer

sp³d

Question 42

Which of the following is the correct order of increasing bond strength in organic compounds?

Accepted Answer

C-C < C=C < C≡C

Answer

C-C < C≡C < C=C

Answer

C≡C < C-C < C=C

Answer

C≡C < C=C < C-C

Question 43

Which of the following is an electrophile?

Accepted Answer

H+

Answer

OH-

Answer

CH3-

Answer

NH3

Question 44

Which of the following is an aromatic compound?

Accepted Answer

Benzene

Answer

Ethene

Answer

Propane

Answer

Cyclohexane

Question 45

Which of the following reactions is characteristic of aromatic compounds?

Accepted Answer

Electrophilic substitution

Answer

Electrophilic addition

Answer

Nucleophilic addition

Answer

Nucleophilic substitution

Question 46

How do Infrared (IR) and Nuclear Magnetic Resonance (NMR) spectroscopy techniques work together to give a complete picture of the structure and bonding of organic molecules?

Accepted Answer

IR spectroscopy reveals functional groups, while NMR spectroscopy shows how atoms are connected.

Answer

Both IR and NMR spectroscopy can find the molecular weight of a compound.

Answer

IR spectroscopy is only for liquids, while NMR spectroscopy is only for solids.

Answer

IR and NMR techniques are not complementary.

Question 47

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

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 48

Which of the following compounds is an aromatic hydrocarbon?

Accepted Answer

Benzene

Answer

Cyclohexane

Answer

Ethene

Answer

Propane

Question 49

What is the hybridization of the carbon atoms in the benzene ring?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 50

Which functional group is characteristic of an alcohol?

Accepted Answer

OH

Answer

C=O

Answer

NH2

Answer

NO2

Question 51

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

Accepted Answer

sp2

Answer

sp3d

Answer

sp3

Answer

sp

Question 52

Which of the following reactions is a characteristic chemical property of alkanes?

Accepted Answer

Combustion

Answer

Addition

Answer

Substitution

Answer

Polymerization

Question 53

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

Accepted Answer

Ester

Answer

Ether

Answer

Ketone

Answer

Amide

Question 54

Which of the following compounds exhibits aromatic properties?

Accepted Answer

Benzene

Answer

Cyclohexane

Answer

Propane

Answer

Ethene

Question 55

What is the hybridization of the nitrogen atom in pyridine?

Accepted Answer

sp2

Answer

sp3

Answer

sp

Answer

sp3d

Question 56

Identify the structural formula that correctly represents ethene.

Accepted Answer

CH2=CH2

Answer

CH3-CH=CH2

Answer

CH3-CH3

Answer

CH2-CHBr

Question 57

Identify the reaction that represents a substitution reaction.

Accepted Answer

CH3-CH2-Br + NaOH → CH3-CH2-OH + NaBr

Answer

CH3-CH2-CH=CH2 + H2 → CH3-CH2-CH2-CH3

Answer

CH3-CH2-CH2-CH3 + Br2 → CH3-CH2-CHBr-CH3

Question 58

Determine the hybridization of the carbon atom involved in the C=C double bond of ethene.

Accepted Answer

sp2

Answer

sp3

Answer

sp

Question 59

Select the characteristic that is unique to aromatic compounds.

Accepted Answer

They undergo electrophilic aromatic substitution reactions.

Answer

They are highly reactive.

Answer

They are insoluble in water.

Question 60

Identify a type of organic polymer.

Accepted Answer

Polyethylene

Answer

Carbon dioxide

Answer

Water

Answer

Sodium chloride

Question 61

Identify the structural formula that represents ethene:

Accepted Answer

CH₂=CH₂

Answer

CH₃-CH₃

Answer

CH₂-CH=CH-CH₃

Answer

CH₂-CHOH-CH₃

Question 62

Determine the hybridization of the carbon atoms in an alkane:

Accepted Answer

sp³

Answer

sp²

Answer

dsp³

Answer

sp

Question 63

Identify the reaction that exemplifies an addition reaction:

Accepted Answer

Ethene (C₂H₄) + Hydrogen (H₂) → Ethane (C₂H₆)

Answer

Methane (CH₄) + Chlorine (Cl₂) → Chloromethane (CH₃Cl)

Answer

Ethene (C₂H₄) + Oxygen (O₂) → Ethylene oxide (C₂H₄O)

Question 64

Provide the IUPAC name for the following compound: CH₃-CH₂-CH(CH₃)-CH₂-CH₃

Accepted Answer

2-Methylpentane

Answer

3,3-Dimethylbutane

Answer

2,2-Dimethylbutane

Answer

3-Methylpentane