NEET UG - Classification isomerism IUPAC nomenclature methods of preparation properties and reactions Online Test (MCQ Quiz)

1. What is the primary classification of hydrocarbons?

A) Aliphatic and Aromatic B) Saturated and Unsaturated C) Cyclic and Acyclic D) Open-chain and Closed-chain

2. Which type of hydrocarbon contains only single bonds between carbon atoms?

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

3. Hydrocarbons with at least one carbon-carbon double bond are classified as:

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

4. Which hydrocarbons contain a carbon-carbon triple bond?

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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. 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

15. What is the suffix for alkanes in IUPAC nomenclature?

A) -ene B) -yne C) -ane D) -ol

16. What is the suffix for alkenes in IUPAC nomenclature?

A) -ane B) -yne C) -ene D) -al

17. The IUPAC suffix for alkynes is:

A) -ene B) -ane C) -yne D) -one

18. For branched alkanes, the longest continuous carbon chain is identified as the:

A) Side chain B) Parent chain C) Branch D) Substituent

19. 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

20. What is the IUPAC name for CH3-CH2-CH3?

A) Ethane B) Propane C) Butane D) Pentane

21. What is the IUPAC name for CH3-CH=CH2?

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

22. What is the IUPAC name for CH≡C-CH3?

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

23. What is the IUPAC name for C6H6?

A) Hexane B) Cyclohexane C) Benzene D) Toluene

24. 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

25. Kolbe's electrolysis is a method for the preparation of:

A) Alkenes B) Alkynes C) Alkanes D) Aromatic hydrocarbons

26. Wurtz reaction is used to prepare:

A) Alkenes B) Alkynes C) Higher alkanes D) Aromatic compounds

27. The preparation of ethene from ethanol involves:

A) Oxidation B) Reduction C) Dehydration D) Addition

28. Alkynes can be prepared by the dehydrohalogenation of:

A) Alkanes B) Alkenes C) Vicinal or geminal dihalides D) Alcohols

29. 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

30. The characteristic reactions of alkanes are primarily:

A) Addition reactions B) Substitution reactions C) Elimination reactions D) Rearrangement reactions

31. 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

32. Combustion of hydrocarbons typically produces:

A) Carbon monoxide and water B) Carbon dioxide and water C) Carbon and water D) Hydrogen and carbon monoxide

33. Incomplete combustion of hydrocarbons can produce:

A) Carbon dioxide B) Water C) Carbon monoxide D) Oxygen

34. Alkenes undergo which type of reaction readily?

A) Substitution B) Addition C) Elimination D) Oxidation

35. The addition of halogens (e.g., Br2) to alkenes results in:

A) Oxidation B) Reduction C) Halogenation D) Dehydrohalogenation

36. 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

37. The addition of water to alkenes in the presence of an acid catalyst is called:

A) Dehydration B) Hydrogenation C) Hydration D) Halogenation

38. Ozonolysis of alkenes leads to the formation of:

A) Alcohols B) Ketones and aldehydes C) Esters D) Ethers

39. Alkynes are generally:

A) Less reactive than alkenes B) More reactive than alkenes C) Equally reactive as alkenes D) Unreactive towards addition

40. 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

41. The reaction of terminal alkynes with sodium amide (NaNH2) produces:

A) Alkanes B) Alkenes C) Acetylides D) Aromatic compounds

42. Benzene undergoes which type of reaction primarily?

A) Addition reaction B) Substitution reaction C) Elimination reaction D) Oxidation

43. 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

44. 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

45. 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

46. 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

47. The presence of a triple bond in a hydrocarbon makes it:

A) Saturated B) Unsaturated C) Aromatic D) Cyclic

48. 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

49. 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

50. 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

Classification isomerism IUPAC nomenclature methods of preparation properties and reactions - Online Test

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