Classification isomerism IUPAC nomenclature methods of preparation properties and reactions - Question Bank

1. What is the IUPAC name for the compound CH3-CH(CH3)-CH2-CH3?
A) n-Pentane
B) Isopentane
C) 2-Methylbutane
D) 3-Methylbutane
2. When is the cis-isomer of a disubstituted alkene more stable than the trans-isomer?
A) When the identical groups are large and bulky
B) When the identical groups are small
C) Never, trans is always more stable
D) Only in the presence of a catalyst
3. Which of the following is an example of positional isomerism?
A) Butane and Isobutane
B) 1-Butene and 2-Butene
C) Ethanol and Dimethyl ether
D) Cyclohexane and Hexene
4. Which of the following is an example of chain isomerism?
A) Ethanol and Dimethyl ether
B) 1-Propanol and 2-Propanol
C) Butane and Isobutane
D) Ethyl methyl ether and Diethyl ether
5. The presence of a triple bond in a hydrocarbon makes it:
A) Saturated
B) Unsaturated
C) Aromatic
D) Cyclic
6. Which of the following is a characteristic reaction of aromatic compounds that maintains the aromaticity?
A) Addition across the double bonds
B) Substitution at the ring carbons
C) Polymerization
D) Dehydrogenation
7. Friedel-Crafts alkylation involves the reaction of benzene with:
A) Alkyl halides in the presence of Lewis acid
B) Alcohols in the presence of acid
C) Alkenes in the presence of acid
D) Alkyl halides in the presence of base
8. What is the product of nitration of benzene using a mixture of concentrated nitric acid and concentrated sulfuric acid?
A) Chlorobenzene
B) Nitrobenzene
C) Benzenesulfonic acid
D) Toluene
9. Electrophilic aromatic substitution reactions of benzene include:
A) Halogenation, Nitration, Sulfonation, Friedel-Crafts
B) Hydrogenation, Ozonolysis, Combustion
C) Addition of HX, Hydration
D) Wurtz reaction, Kolbe's reaction
10. Benzene undergoes which type of reaction primarily?
A) Addition reaction
B) Substitution reaction
C) Elimination reaction
D) Oxidation
11. The reaction of terminal alkynes with sodium amide (NaNH2) produces:
A) Alkanes
B) Alkenes
C) Acetylides
D) Aromatic compounds
12. The addition of hydrogen to alkynes in the presence of a catalyst like Pd/BaSO4 (Lindlar's catalyst) yields:
A) Alkanes
B) Alkenes (cis isomer)
C) Alkenes (trans isomer)
D) Alkynes
13. Alkynes are generally:
A) Less reactive than alkenes
B) More reactive than alkenes
C) Equally reactive as alkenes
D) Unreactive towards addition
14. Ozonolysis of alkenes leads to the formation of:
A) Alcohols
B) Ketones and aldehydes
C) Esters
D) Ethers
15. The addition of water to alkenes in the presence of an acid catalyst is called:
A) Dehydration
B) Hydrogenation
C) Hydration
D) Halogenation
16. Electrophilic addition of HBr to propene follows Markovnikov's rule, leading to the formation of:
A) 1-bromopropane
B) 2-bromopropane
C) Propane
D) Propyne
17. The addition of halogens (e.g., Br2) to alkenes results in:
A) Oxidation
B) Reduction
C) Halogenation
D) Dehydrohalogenation
18. Alkenes undergo which type of reaction readily?
A) Substitution
B) Addition
C) Elimination
D) Oxidation
19. Incomplete combustion of hydrocarbons can produce:
A) Carbon dioxide
B) Water
C) Carbon monoxide
D) Oxygen
20. Combustion of hydrocarbons typically produces:
A) Carbon monoxide and water
B) Carbon dioxide and water
C) Carbon and water
D) Hydrogen and carbon monoxide
21. Alkanes react with halogens in the presence of sunlight or UV light via:
A) Electrophilic substitution
B) Nucleophilic substitution
C) Free radical substitution
D) Addition reaction
22. The characteristic reactions of alkanes are primarily:
A) Addition reactions
B) Substitution reactions
C) Elimination reactions
D) Rearrangement reactions
23. Which reaction is commonly used to prepare acetylene (ethyne)?
A) Cracking of petroleum
B) Hydrolysis of calcium carbide
C) Decarboxylation of propanoic acid
D) Wurtz reaction
24. Alkynes can be prepared by the dehydrohalogenation of:
A) Alkanes
B) Alkenes
C) Vicinal or geminal dihalides
D) Alcohols
25. The preparation of ethene from ethanol involves:
A) Oxidation
B) Reduction
C) Dehydration
D) Addition
26. Wurtz reaction is used to prepare:
A) Alkenes
B) Alkynes
C) Higher alkanes
D) Aromatic compounds
27. Kolbe's electrolysis is a method for the preparation of:
A) Alkenes
B) Alkynes
C) Alkanes
D) Aromatic hydrocarbons
28. Which of the following is a method for preparing alkanes?
A) Ozonolysis of alkenes
B) Catalytic hydrogenation of alkenes and alkynes
C) Electrolysis of carboxylic acids (Kolbe's reaction)
D) Addition of HX to alkenes
29. What is the IUPAC name for C6H6?
A) Hexane
B) Cyclohexane
C) Benzene
D) Toluene
30. What is the IUPAC name for CH≡C-CH3?
A) Propene
B) Ethyne
C) Propyne
D) Butyne
31. What is the IUPAC name for CH3-CH=CH2?
A) Propane
B) Propene
C) Propyne
D) Ethene
32. What is the IUPAC name for CH3-CH2-CH3?
A) Ethane
B) Propane
C) Butane
D) Pentane
33. When numbering the parent chain in IUPAC nomenclature, the substituents should receive the:
A) Highest possible number
B) Lowest possible number
C) Odd number
D) Even number
34. For branched alkanes, the longest continuous carbon chain is identified as the:
A) Side chain
B) Parent chain
C) Branch
D) Substituent
35. The IUPAC suffix for alkynes is:
A) -ene
B) -ane
C) -yne
D) -one
36. What is the suffix for alkenes in IUPAC nomenclature?
A) -ane
B) -yne
C) -ene
D) -al
37. What is the suffix for alkanes in IUPAC nomenclature?
A) -ene
B) -yne
C) -ane
D) -ol
38. The IUPAC nomenclature system aims to provide:
A) A common name for every compound
B) A unique and systematic name for every compound
C) A name based on the source of the compound
D) A name based on its physical properties
39. In geometrical isomerism (cis-trans), the 'cis' isomer has similar groups on:
A) Opposite sides of the double bond
B) The same side of the double bond
C) Different carbon atoms
D) Different planes
40. Geometrical isomerism is possible in alkenes when each carbon atom of the double bond is attached to:
A) Two identical groups
B) Two different groups
C) One hydrogen atom
D) Three identical groups
41. Which type of isomerism occurs in compounds with the same molecular formula but different alkyl groups attached to the same polyvalent atom?
A) Functional isomerism
B) Chain isomerism
C) Positional isomerism
D) Metamerism
42. Isomerism in which compounds have the same molecular formula and the same chain length but differ in the nature of the functional group is known as:
A) Positional isomerism
B) Chain isomerism
C) Functional isomerism
D) Metamerism
43. Compounds that have the same molecular formula and the same carbon skeleton but differ in the position of a functional group or substituent are called:
A) Chain isomers
B) Positional isomers
C) Functional isomers
D) Metamers
44. Which type of structural isomerism arises from different arrangements of carbon atoms in the main chain?
A) Positional isomerism
B) Functional isomerism
C) Chain isomerism
D) Metamerism
45. Isomerism where compounds have the same molecular formula and the same connectivity of atoms but differ in the spatial arrangement of atoms is called:
A) Structural isomerism
B) Chain isomerism
C) Positional isomerism
D) Stereoisomerism
46. What type of isomerism involves compounds with the same molecular formula but different structural formulas?
A) Stereoisomerism
B) Geometrical isomerism
C) Structural isomerism
D) Optical isomerism
47. Aromatic hydrocarbons are characterized by:
A) Presence of only single bonds
B) Presence of a triple bond
C) A cyclic structure with delocalized pi electrons
D) An open chain structure
48. Which hydrocarbons contain a carbon-carbon triple bond?
A) Alkenes
B) Alkynes
C) Alkanes
D) Arenes
49. Hydrocarbons with at least one carbon-carbon double bond are classified as:
A) Alkanes
B) Alkynes
C) Alkenes
D) Cycloalkanes
50. Which type of hydrocarbon contains only single bonds between carbon atoms?
A) Alkenes
B) Alkynes
C) Alkanes
D) Aromatics