JEE Main - Classification of organic compounds functional groups and homologous series Online Test (MCQ Quiz)

1. Which of the following is an example of an alkane?

A) Ethene B) Ethyne C) Propane D) Ethanol

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

A) Aldehydes B) Ketones C) Alcohols D) Ethers

3. 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

4. Which functional group is represented by -COOH?

A) Ester B) Carboxylic acid C) Amide D) Aldehyde

5. The general formula for alkenes is:

A) CnH2n+2 B) CnH2n-2 C) CnH2n D) CnH2n+1

6. Which of the following is a ketone?

A) Propanal B) Propanone C) Propanol D) Propanoic acid

7. The functional group -NH2 is characteristic of:

A) Amines B) Amides C) Nitriles D) Azo compounds

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

A) Diethyl ether B) Ethanol C) Ethanal D) Ethanoic acid

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

A) CH group B) CH2 group C) H2O molecule D) CO group

10. The functional group -CHO is characteristic of:

A) Ketones B) Carboxylic acids C) Aldehydes D) Esters

11. What is the general formula for alkynes?

A) CnH2n B) CnH2n+2 C) CnH2n-2 D) CnHn

12. Which of the following is an ester?

A) Methyl acetate B) Acetic acid C) Acetaldehyde D) Acetone

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

A) Alcohols B) Ethers C) Alkanes D) Haloalkanes

14. 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

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

A) R-OH B) R-CHO C) R-COOR' D) R-COOH

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

A) Ammonia B) Methylamine C) Methanol D) Methane

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

A) Alcohols B) Ethers C) Esters D) Aldehydes

18. Which of the following is a cyclic hydrocarbon?

A) Benzene B) Ethane C) Ethene D) Acetylene

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

A) Propane B) Propene C) Propyne D) Propanol

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

A) Amides B) Nitriles C) Amines D) Imines

21. Which of the following is an aromatic compound?

A) Cyclohexane B) Naphthalene C) Heptane D) Octene

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

A) R-OH B) R-CHO C) R-COOR' D) R-COOH

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

A) -OH B) -COOH C) -CH3 D) -NH2

24. What is the functional group in ethanoic acid?

A) Aldehyde B) Ketone C) Alcohol D) Carboxylic acid

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

A) Propanal B) Propanol C) Propanoic acid D) Propane

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. 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

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

A) Toluene B) Pyridine C) Phenol D) Aniline

29. The general formula for alkanes is:

A) CnH2n B) CnH2n-2 C) CnH2n+2 D) CnH2n+1

30. Which functional group is characteristic of esters?

A) -COOH B) -COOR' C) -CHO D) -C=O

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

A) Heterocyclic compound B) Functionalized compound C) Hydrocarbon D) Polymer

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

A) Alkanes B) Alkenes C) Alkynes D) Cycloalkanes

33. The functional group -CONH2 is characteristic of:

A) Amines B) Nitriles C) Amides D) Imides

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

A) Acetone B) Ethanol C) Ethanal D) Ethanoic acid

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

A) Isomers B) Homologs C) Polymers D) Allotropes

36. The functional group -SH is characteristic of:

A) Thiols B) Thioethers C) Sulfonic acids D) Sulfides

37. Which of the following is a saturated hydrocarbon?

A) Ethene B) Benzene C) Cyclohexane D) Ethane

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

A) R-CHO B) R-CO-R' C) R-COOH D) R-OH

39. 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

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

A) Alkanes B) Alkenes C) Alkynes D) Arenes

41. The compound CH3OCH3 belongs to which homologous series?

A) Alcohols B) Ethers C) Esters D) Aldehydes

42. Which is the simplest alkyne?

A) Ethyne B) Propyne C) Metyne D) Butyne

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

A) Carboxylic acids B) Esters C) Ethers D) Ketones

44. Aliphatic compounds are those that do not contain:

A) Carbon atoms B) Hydrogen atoms C) A benzene ring D) Functional groups

45. Which of the following is an unsaturated hydrocarbon?

A) Propane B) Butane C) Cyclohexane D) Propene

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

A) R-CHO B) R-COOH C) R-OH D) R-O-R'

47. Which functional group is present in acetamide?

A) Amine B) Nitrile C) Amide D) Imine

48. The simplest aromatic hydrocarbon is:

A) Toluene B) Benzene C) Naphthalene D) Xylene

49. Which of the following is a tertiary alcohol?

A) Methanol B) Ethanol C) Propan-2-ol D) 2-Methylpropan-2-ol

50. The functional group -SO3H is characteristic of:

A) Thiols B) Sulfonic acids C) Sulfonamides D) Sulfides

Classification of organic compounds functional groups and homologous series - Online Test

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