JEE Main - Classification of organic compounds functional groups and homologous series Question Bank with Options

1. Which of the following is a diene (a hydrocarbon with two double bonds)?

A) Ethyne

B) Ethene

C) Butadiene

D) Benzene

2. The functional group -SO3H is characteristic of:

A) Thiols

B) Sulfonic acids

C) Sulfonamides

D) Sulfides

3. Which of the following is a tertiary alcohol?

A) Methanol

B) Ethanol

C) Propan-2-ol

D) 2-Methylpropan-2-ol

4. The simplest aromatic hydrocarbon is:

A) Toluene

B) Benzene

C) Naphthalene

D) Xylene

5. Which functional group is present in acetamide?

A) Amine

B) Nitrile

C) Amide

D) Imine

6. The homologous series of alcohols has the general formula:

A) R-CHO

B) R-COOH

C) R-OH

D) R-O-R'

7. Which of the following is an unsaturated hydrocarbon?

A) Propane

B) Butane

C) Cyclohexane

D) Propene

8. Aliphatic compounds are those that do not contain:

A) Carbon atoms

B) Hydrogen atoms

C) A benzene ring

D) Functional groups

9. The functional group -O-C(=O)-R' is characteristic of:

A) Carboxylic acids

B) Esters

C) Ethers

D) Ketones

10. Which is the simplest alkyne?

A) Ethyne

B) Propyne

C) Metyne

D) Butyne

11. The compound CH3OCH3 belongs to which homologous series?

A) Alcohols

B) Ethers

C) Esters

D) Aldehydes

12. Which class of organic compounds has the functional group -C≡C-?

A) Alkanes

B) Alkenes

C) Alkynes

D) Arenes

13. What distinguishes a primary alcohol from a secondary alcohol?

A) The number of carbon atoms

B) The position of the -OH group relative to alkyl groups

C) The presence of a double bond

D) The presence of a ring structure

14. The homologous series of ketones has the general formula:

A) R-CHO

B) R-CO-R'

C) R-COOH

D) R-OH

15. Which of the following is a saturated hydrocarbon?

A) Ethene

B) Benzene

C) Cyclohexane

D) Ethane

16. The functional group -SH is characteristic of:

A) Thiols

B) Thioethers

C) Sulfonic acids

D) Sulfides

17. Compounds with the same molecular formula but different structural formulas are called:

A) Isomers

B) Homologs

C) Polymers

D) Allotropes

18. Which of the following is an example of an aldehyde?

A) Acetone

B) Ethanol

C) Ethanal

D) Ethanoic acid

19. The functional group -CONH2 is characteristic of:

A) Amines

B) Nitriles

C) Amides

D) Imides

20. Which of the following has the general formula CnH2n-2?

A) Alkanes

B) Alkenes

C) Alkynes

D) Cycloalkanes

21. A molecule containing only carbon and hydrogen atoms is classified as a:

A) Heterocyclic compound

B) Functionalized compound

C) Hydrocarbon

D) Polymer

22. Which functional group is characteristic of esters?

A) -COOH

B) -COOR'

C) -CHO

D) -C=O

23. The general formula for alkanes is:

A) CnH2n

B) CnH2n-2

C) CnH2n+2

D) CnH2n+1

24. Which of the following is an example of a heterocyclic compound?

A) Toluene

B) Pyridine

C) Phenol

D) Aniline

25. The functional group -C=O is present in both:

A) Alcohols and Ethers

B) Aldehydes and Ketones

C) Carboxylic acids and Esters

D) Amines and Amides

26. The presence of a benzene ring in a molecule indicates it is:

A) An aliphatic compound

B) An aromatic compound

C) A cycloalkane

D) A heterocyclic compound

27. Which of the following compounds belongs to the same homologous series as ethanol?

A) Propanal

B) Propanol

C) Propanoic acid

D) Propane

28. What is the functional group in ethanoic acid?

A) Aldehyde

B) Ketone

C) Alcohol

D) Carboxylic acid

29. Which of the following is NOT a functional group?

A) -OH

B) -COOH

C) -CH3

D) -NH2

30. The homologous series of aldehydes has the general formula:

A) R-OH

B) R-CHO

C) R-COOR'

D) R-COOH

31. Which of the following is an aromatic compound?

A) Cyclohexane

B) Naphthalene

C) Heptane

D) Octene

32. The functional group -C≡N is characteristic of:

A) Amides

B) Nitriles

C) Amines

D) Imines

33. A compound with the molecular formula C3H6 can be:

A) Propane

B) Propene

C) Propyne

D) Propanol

34. Which of the following is a cyclic hydrocarbon?

A) Benzene

B) Ethane

C) Ethene

D) Acetylene

35. The functional group -O- linking two alkyl or aryl groups is characteristic of:

A) Alcohols

B) Ethers

C) Esters

D) Aldehydes

36. Which of the following is an example of an amine?

A) Ammonia

B) Methylamine

C) Methanol

D) Methane

37. The homologous series of carboxylic acids has the general formula:

A) R-OH

B) R-CHO

C) R-COOR'

D) R-COOH

38. Which class of compounds contains the functional group C=O bonded to two alkyl or aryl groups?

A) Aldehydes

B) Carboxylic acids

C) Ketones

D) Esters

39. The functional group -X (where X = F, Cl, Br, I) is characteristic of:

A) Alcohols

B) Ethers

C) Alkanes

D) Haloalkanes

40. Which of the following is an ester?

A) Methyl acetate

B) Acetic acid

C) Acetaldehyde

D) Acetone

41. What is the general formula for alkynes?

A) CnH2n

B) CnH2n+2

C) CnH2n-2

D) CnHn

42. The functional group -CHO is characteristic of:

A) Ketones

B) Carboxylic acids

C) Aldehydes

D) Esters

43. Compounds in a homologous series differ from each other by a:

A) CH group

B) CH2 group

C) H2O molecule

D) CO group

44. Which of the following is an example of an ether?

A) Diethyl ether

B) Ethanol

C) Ethanal

D) Ethanoic acid

45. The functional group -NH2 is characteristic of:

A) Amines

B) Amides

C) Nitriles

D) Azo compounds

46. Which of the following is a ketone?

A) Propanal

B) Propanone

C) Propanol

D) Propanoic acid

47. The general formula for alkenes is:

A) CnH2n+2

B) CnH2n-2

C) CnH2n

D) CnH2n+1

48. Which functional group is represented by -COOH?

A) Ester

B) Carboxylic acid

C) Amide

D) Aldehyde

49. A homologous series is a group of organic compounds that have the same functional group and:

A) Different molecular formulas

B) Similar chemical properties

C) Different general formulas

D) Varying positions of the functional group

50. The functional group -OH is characteristic of which class of organic compounds?

A) Aldehydes

B) Ketones

C) Alcohols

D) Ethers

Classification of organic compounds functional groups and homologous series - Question Bank