JEE Main - Isomerism structural and stereoisomerism and IUPAC nomenclature basics Online Test (MCQ Quiz)

1. What is the fundamental difference between structural isomerism and stereoisomerism?

A) Structural isomers have different connectivity of atoms, while stereoisomers have the same connectivity but different spatial arrangement. B) Stereoisomers have different connectivity of atoms, while structural isomers have the same connectivity but different spatial arrangement. C) Structural isomers are only found in cyclic compounds, while stereoisomers are found in acyclic compounds. D) Stereoisomers are always chiral, while structural isomers are never chiral.

2. Which type of isomerism arises due to different arrangements of atoms or groups in space?

A) Chain isomerism B) Positional isomerism C) Functional isomerism D) Stereoisomerism

3. Two compounds with the same molecular formula but different carbon skeletons are called:

A) Positional isomers B) Chain isomers C) Functional isomers D) Geometrical isomers

4. Which of the following pairs represents functional isomers?

A) Butane and Isobutane B) 1-Propanol and 2-Propanol C) Ethanol and Dimethyl ether D) Cyclohexane and Hex-1-ene

5. What is the IUPAC name for CH3-CH(CH3)-CH2-CH3?

A) 2-Methylbutane B) 3-Methylbutane C) 2-Ethylpropane D) Isobutane

6. Compounds that have the same molecular formula and the same carbon skeleton but differ in the position of a substituent or functional group are known as:

A) Chain isomers B) Positional isomers C) Stereoisomers D) Metamers

7. Which of the following is NOT a type of structural isomerism?

A) Chain isomerism B) Positional isomerism C) Geometrical isomerism D) Functional isomerism

8. Chirality is a property of a molecule that:

A) Has a plane of symmetry B) Is non-superimposable on its mirror image C) Has a center of symmetry D) Is superimposable on its mirror image

9. Molecules that are non-superimposable mirror images of each other are called:

A) Diastereomers B) Meso compounds C) Enantiomers D) Conformational isomers

10. A compound that is superimposable on its mirror image is:

A) Chiral B) Achiral C) Optically active D) An enantiomer

11. What is the IUPAC name for CH3-CH2-O-CH2-CH3?

A) Diethyl ether B) Ethyl methyl ether C) Methoxyethane D) Ethoxyethane

12. Which of the following molecules contains a chiral center?

A) Methane B) Ethane C) 2-Chlorobutane D) Butane

13. Geometrical isomerism is typically observed in compounds with:

A) Single bonds B) Double bonds or rings C) Triple bonds D) Lone pairs of electrons

14. The IUPAC name for the following structure: CH3-CH=CH-CH3 is:

A) But-1-ene B) But-2-ene C) 2-Butene D) But-2-ene

15. Which type of isomerism arises from restricted rotation around a single bond?

A) Positional isomerism B) Functional isomerism C) Conformational isomerism D) Geometrical isomerism

16. What is the IUPAC name for the compound with the structure: CH3-CH(OH)-CH2-CH3?

A) 1-Butanol B) 2-Butanol C) Butan-1-ol D) Butan-2-ol

17. A molecule that has a plane of symmetry is:

A) Chiral B) Achiral C) Optically inactive D) Both B and C

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

A) 1-Propanol and 2-Propanol B) Ethanol and Dimethyl ether C) Diethyl ether and Methyl propyl ether D) Butane and Isobutane

19. The 'cis' isomer in geometrical isomerism has similar groups on:

A) Opposite sides of the double bond B) The same side of the double bond C) Opposite sides of the ring D) The same side of the ring

20. What is the IUPAC name for the compound CH3-C(=O)-CH2-CH3?

A) Butanal B) Butanone C) Propanone D) Pentanone

21. Stereoisomers that are not enantiomers are called:

A) Diastereomers B) Meso compounds C) Enantiomers D) Anomers

22. Which of the following compounds exhibits tautomerism?

A) Ethanol B) Acetone C) Benzene D) Methane

23. The IUPAC name for the following alkene: CH2=CH-CH2-CH3 is:

A) But-1-ene B) But-2-ene C) 2-Butene D) Butene

24. A chiral molecule that possesses a plane of symmetry is called a:

A) Chiral compound B) Meso compound C) Racemic mixture D) Diastereomer

25. Which of the following is a type of stereoisomerism?

A) Chain isomerism B) Positional isomerism C) Functional isomerism D) Geometrical isomerism

26. The IUPAC name for the compound with the structure: Cl-CH2-CH2-Cl is:

A) 1,2-Dichloromethane B) 1,2-Dichloroethane C) 1,1-Dichloroethane D) Dichloromethane

27. Compounds that have the same molecular formula but differ in the nature or number of alkyl groups attached to a polyvalent atom are called:

A) Positional isomers B) Chain isomers C) Metamers D) Functional isomers

28. Which of the following is a requirement for geometrical isomerism in alkenes?

A) Presence of a chiral center B) Two different groups on each carbon of the double bond C) A plane of symmetry D) Restricted rotation around a single bond

29. What is the IUPAC name for CH3-CH2-CH2-OH?

A) 2-Propanol B) 1-Propanol C) Propan-2-ol D) Propan-1-ol

30. Enantiomers have:

A) Identical physical properties B) Identical chemical properties (except with chiral reagents) C) Identical optical activity D) Both A and B

31. Which of the following is a type of structural isomerism?

A) Enantiomerism B) Diastereomerism C) Positional isomerism D) Conformational isomerism

32. The 'trans' isomer in geometrical isomerism has similar groups on:

A) The same side of the double bond B) Opposite sides of the double bond C) The same side of the ring D) Opposite sides of the ring

33. What is the IUPAC name for the compound with the structure: CH3-CH2-C(=O)-CH3?

A) Butanone B) Butanal C) Pentanone D) Propanone

34. A mixture of equal amounts of two enantiomers is called:

A) A meso compound B) A diastereomeric mixture C) A racemic mixture D) An optically pure sample

35. Tautomerism is a special case of:

A) Positional isomerism B) Functional isomerism C) Chain isomerism D) Metamerism

36. Which of the following is NOT an IUPAC naming rule?

A) Select the longest carbon chain containing the principal functional group. B) Number the chain to give the lowest possible number to the principal functional group. C) Use prefixes like 'iso', 'sec', 'tert' for branches. D) Alphabetically arrange the substituents.

37. What is the IUPAC name for the compound CH3-CH(Cl)-CH2-CH3?

A) 1-Chlorobutane B) 2-Chlorobutane C) 3-Chlorobutane D) Butyl chloride

38. Which of the following pairs are positional isomers?

A) Ethanol and Dimethyl ether B) 1-Butyne and 2-Butyne C) Propanal and Propanone D) Cyclohexane and Hex-1-ene

39. Diastereomers have:

A) Same connectivity, different spatial arrangement, and are non-superimposable mirror images. B) Same connectivity, different spatial arrangement, and are not mirror images. C) Different connectivity. D) Same connectivity, same spatial arrangement, but different conformation.

40. What is the IUPAC name for the compound: CH3-CH2-NH-CH3?

A) N-Methylpropanamine B) Ethylmethylamine C) N-Methylethanamine D) Propylamine

41. Optical activity is the ability of a chiral compound to:

A) Rotate plane-polarized light clockwise B) Rotate plane-polarized light counterclockwise C) Rotate plane-polarized light D) Absorb UV-Vis light

42. Which of the following is a type of stereoisomerism that arises from restricted rotation around single bonds?

A) Geometrical isomerism B) Enantiomerism C) Conformational isomerism D) Diastereomerism

43. What is the IUPAC name for CH3-CH2-COOH?

A) Ethanoic acid B) Propanoic acid C) Acetic acid D) Butanoic acid

44. Which of the following is an example of chain isomerism?

A) 1-Propanol and 2-Propanol B) Ethanol and Dimethyl ether C) Butane and Isobutane D) Diethyl ether and Methyl propyl ether

45. A molecule with the formula C4H10O can exhibit which type of isomerism?

A) Only chain isomerism B) Only positional isomerism C) Functional isomerism and chain isomerism D) Metamerism and positional isomerism

46. The IUPAC name for the following structure: (CH3)3C-CH2-CH3 is:

A) 2,2-Dimethylbutane B) 3,3-Dimethylbutane C) tert-Hexane D) Neohexane

47. Which of the following is a pair of enantiomers?

A) cis-but-2-ene and trans-but-2-ene B) (R)-2-chlorobutane and (S)-2-chlorobutane C) 1-Propanol and 2-Propanol D) Ethanol and Dimethyl ether

48. What does the prefix 'cyclo-' indicate in IUPAC nomenclature?

A) A branched chain B) A double bond C) A ring structure D) A functional group

49. Which of the following is a correct IUPAC name?

A) sec-Butyl alcohol B) iso-Propyl chloride C) 2-Methylpropan-2-ol D) tert-Butyl bromide

50. Two compounds having the same molecular formula but different functional groups are called:

A) Chain isomers B) Positional isomers C) Functional isomers D) Metamers

Isomerism structural and stereoisomerism and IUPAC nomenclature basics - Online Test

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