ORGANIC CHEMISTRY QUIZ: Testing Your Knowledge on organic Chemistry:
Organic chemistry is the branch of chemistry that studies carbon-containing compounds and their reactions. It is central to understanding fuels, medicines, plastics, and biological molecules. This quiz covers structures, functional groups, and common reactions in organic chemistry.
1. Which element is the backbone of organic compounds?
A. Hydrogen
B. Oxygen
C. Carbon
D. Nitrogen
2. Which of the following is an alkane?
A. CH₄
B. C₂H₄
C. C₂H₂
D. CH₃OH
3. Alkenes are hydrocarbons that contain
A. Only single bonds
B. At least one double bond
C. At least one triple bond
D. No carbon
4. Alkynes are characterized by
A. Single bonds only
B. Double bonds only
C. Triple bonds
D. Rings
5. Which functional group is present in alcohols?
A. –OH
B. –COOH
C. –CHO
D. –NH₂
Organic Chemistry Quiz
6. Which functional group is present in carboxylic acids?
A. –OH
B. –COOH
C. –CHO
D. –NH₂
7. Methane (CH₄) is classified as
A. Alkane
B. Alkene
C. Alkyne
D. Alcohol
8. Ethene (C₂H₄) is commonly used in
A. Fertilizer
B. Polymer production
C. Fuel only
D. Soap
9. The general formula for alkanes is
A. CnH2n+2
B. CnH2n
C. CnH2n−2
D. CnHn
10. The general formula for alkenes is
A. CnH2n+2
B. CnH2n
C. CnH2n−2
D. CnHn
Organic Chemistry Quiz
11. Which of these is an aromatic compound?
A. Benzene
B. Ethanol
C. Methane
D. Acetylene
12. A homologous series has compounds with
A. Same molecular formula
B. Same functional group and similar structure
C. Same boiling point
D. Different functional groups only
13. Which reaction type involves addition of atoms to a double bond?
A. Substitution
B. Addition
C. Elimination
D. Combustion
14. Substitution reactions are typical for
A. Alkanes
B. Alkenes
C. Alkynes
D. Alcohols only
15. Combustion of organic compounds produces
A. Water and CO₂
B. Salt
C. Hydrogen gas only
D. Oxygen gas
Organic Chemistry Quiz
16. Isomers are compounds with
A. Same structure but different molecular formula
B. Same molecular formula but different structure
C. Same boiling point
D. Same functional group only
17. Ethanol can be oxidized to
A. Methanol
B. Acetic acid
C. Ethane
D. Propanol
18. Which of the following is a primary alcohol?
A. CH₃CH₂OH
B. CH₃OH
C. CH₃CHOHCH₃
D. C₂H₅OH₂
19. Polymers are formed by
A. Decomposition reactions
B. Addition or condensation reactions
C. Oxidation only
D. Combustion
20. Functional groups determine
A. Physical and chemical properties of organic compounds
B. Only physical properties
C. Only molecular weight
D. Only color
ANSWERS AND EXPLANATIONS On Organic Chemistry Quiz
1. C – Carbon forms four covalent bonds, allowing long chains and rings, making it the backbone of all organic compounds and biomolecules.
2. A – CH₄ is methane, a saturated hydrocarbon with single bonds only, making it an alkane.
3. B – Alkenes contain at least one carbon–carbon double bond, which makes them unsaturated and reactive.
4. C – Alkynes have one or more carbon–carbon triple bonds, making them highly reactive and unsaturated hydrocarbons.
5. A – Alcohols have the hydroxyl group (–OH) attached to carbon, giving them unique polarity and reactivity.
6. B – Carboxylic acids contain –COOH, combining a carbonyl and hydroxyl group, making them acidic in nature.
7. A – Methane (CH₄) has only single bonds between carbon and hydrogen, classifying it as an alkane.
8. B – Ethene (C₂H₄) is widely used in polymer production, such as polyethylene for plastics.
9. A – Alkanes follow CnH2n+2 general formula, showing they are saturated hydrocarbons.
10. B – Alkenes follow CnH2n, reflecting the presence of one double bond per molecule.
11. A – Benzene is aromatic with delocalized π electrons in a six-carbon ring, giving stability.
12. B – Homologous series share the same functional group and similar chemical properties but differ by –CH₂– units.
13. B – Addition reactions occur in alkenes/alkynes, where atoms add across double or triple bonds.
14. A – Substitution reactions replace hydrogen or atoms in alkanes, typically in halogenation reactions.
15. A – Combustion of organic compounds releases energy, producing carbon dioxide and water as products.
16. B – Isomers have the same molecular formula but different structural arrangements, giving distinct properties.
17. B – Ethanol oxidizes to acetic acid in the presence of oxidizing agents like potassium permanganate.
18. A – CH₃CH₂OH is a primary alcohol because the –OH group is attached to a carbon bonded to only one other carbon.
19. B – Polymers are formed via addition or condensation polymerization, creating long chains from monomers.
20. A – Functional groups determine chemical reactivity, boiling/melting points, polarity, and solubility of organic compounds.
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