Isomerism structural and stereoisomerism and IUPAC nomenclature basics - Question Bank

1. Two compounds having the same molecular formula but different functional groups are called:
A) Chain isomers
B) Positional isomers
C) Functional isomers
D) Metamers
2. 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
3. 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
4. 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
5. 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
6. 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
7. 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
8. What is the IUPAC name for CH3-CH2-COOH?
A) Ethanoic acid
B) Propanoic acid
C) Acetic acid
D) Butanoic acid
9. 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
10. 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
11. What is the IUPAC name for the compound: CH3-CH2-NH-CH3?
A) N-Methylpropanamine
B) Ethylmethylamine
C) N-Methylethanamine
D) Propylamine
12. 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.
13. 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
14. 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
15. 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.
16. Tautomerism is a special case of:
A) Positional isomerism
B) Functional isomerism
C) Chain isomerism
D) Metamerism
17. 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
18. What is the IUPAC name for the compound with the structure: CH3-CH2-C(=O)-CH3?
A) Butanone
B) Butanal
C) Pentanone
D) Propanone
19. 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
20. Which of the following is a type of structural isomerism?
A) Enantiomerism
B) Diastereomerism
C) Positional isomerism
D) Conformational isomerism
21. Enantiomers have:
A) Identical physical properties
B) Identical chemical properties (except with chiral reagents)
C) Identical optical activity
D) Both A and B
22. What is the IUPAC name for CH3-CH2-CH2-OH?
A) 2-Propanol
B) 1-Propanol
C) Propan-2-ol
D) Propan-1-ol
23. 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
24. 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
25. 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
26. Which of the following is a type of stereoisomerism?
A) Chain isomerism
B) Positional isomerism
C) Functional isomerism
D) Geometrical isomerism
27. A chiral molecule that possesses a plane of symmetry is called a:
A) Chiral compound
B) Meso compound
C) Racemic mixture
D) Diastereomer
28. 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
29. Which of the following compounds exhibits tautomerism?
A) Ethanol
B) Acetone
C) Benzene
D) Methane
30. Stereoisomers that are not enantiomers are called:
A) Diastereomers
B) Meso compounds
C) Enantiomers
D) Anomers
31. What is the IUPAC name for the compound CH3-C(=O)-CH2-CH3?
A) Butanal
B) Butanone
C) Propanone
D) Pentanone
32. 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
33. 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
34. A molecule that has a plane of symmetry is:
A) Chiral
B) Achiral
C) Optically inactive
D) Both B and C
35. 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
36. Which type of isomerism arises from restricted rotation around a single bond?
A) Positional isomerism
B) Functional isomerism
C) Conformational isomerism
D) Geometrical isomerism
37. 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
38. Geometrical isomerism is typically observed in compounds with:
A) Single bonds
B) Double bonds or rings
C) Triple bonds
D) Lone pairs of electrons
39. Which of the following molecules contains a chiral center?
A) Methane
B) Ethane
C) 2-Chlorobutane
D) Butane
40. What is the IUPAC name for CH3-CH2-O-CH2-CH3?
A) Diethyl ether
B) Ethyl methyl ether
C) Methoxyethane
D) Ethoxyethane
41. A compound that is superimposable on its mirror image is:
A) Chiral
B) Achiral
C) Optically active
D) An enantiomer
42. Molecules that are non-superimposable mirror images of each other are called:
A) Diastereomers
B) Meso compounds
C) Enantiomers
D) Conformational isomers
43. 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
44. Which of the following is NOT a type of structural isomerism?
A) Chain isomerism
B) Positional isomerism
C) Geometrical isomerism
D) Functional isomerism
45. 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
46. What is the IUPAC name for CH3-CH(CH3)-CH2-CH3?
A) 2-Methylbutane
B) 3-Methylbutane
C) 2-Ethylpropane
D) Isobutane
47. 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
48. 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
49. 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
50. 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.
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