General Chemistry I — 2026-test Past Questions

University of Ilorin CHM102: 88 questions.

Topics: Nomenclature and functional group classes of organic compounds, Chemistry of alkanes, alkenes, alkynes, alcohols, ethers, amines, alkyl halides, nitriles, aldehydes, ketones, carboxylic acids, and derivatives, Introduction to transition metal chemistry, Comparative chemistry of group IA, IIA, and IVA elements, Chemistry of selected metals and non-metals, Introductory reaction mechanisms and kinetics, Electronic theory in organic chemistry

  1. The element with configuration 1s² 2s² 2p⁶ 3s² is a:
    1. Metal
    2. Metalloid
    3. Non-metal
    4. Noble gas
  2. Elements on the right hand side of the periodic table are:
    1. Metalloids
    2. Metals
    3. Non-metals
    4. Ferrous
  3. An atom of calcium (atomic number 20) contains how many electrons in the third energy level?
    1. 10
    2. 18
    3. 8
    4. 2
  4. An element of atomic number 24 belongs to which block?
    1. S block
    2. P block
    3. D block
    4. F block
  5. An element with atomic number 55 belongs to which block?
    1. S block
    2. P block
    3. D block
    4. F block
  6. An element with mass number 31 and atomic number 15 has how many neutrons?
    1. 31
    2. 15
    3. 16
    4. 12
  7. Group 1 elements have a valency of?
    1. 1
    2. 2
    3. 3
    4. 4
  8. Which property is not common to both alkali and alkaline earth metals?
    1. S-block element
    2. P-block element
    3. Very reactive
    4. Form basic oxides
  9. Which of the following is not in the first transition series?
    1. Ag
    2. Fe
    3. Cr
    4. Ni
  10. The interatomic bonding in transition metals is enhanced due to:
    1. Van der Waals forces
    2. P-P overlap
    3. Involvement of unpaired d-electrons in metallic bonding
    4. Ionic bonds
  11. Why are transition metal compounds coloured?
    1. Due to variable oxidation states
    2. Due to d-d electron transitions
    3. Due to metallic bonding
    4. Due to unpaired s electrons
  12. Which of the following is diamagnetic?
    1. Zn
    2. Fe
    3. Cr
    4. Mn
  13. The highest oxidation number of manganese is?
    1. +4
    2. +5
    3. +6
    4. +7
  14. Which of these Fe ions is the most stable?
    1. Fe²⁺
    2. Fe³⁺
    3. Fe⁴⁺
    4. Fe⁶⁺
  15. Which of the following is a colourless transition metal ion?
    1. Ti³⁺
    2. Sn²⁺
    3. Cu²⁺
    4. Zn²⁺
  16. Which of the following transition metals has the highest melting point?
    1. Mn
    2. Cu
    3. Zn
    4. Ti
  17. Which of the following is not a characteristic of transition metals?
    1. Variable oxidation state
    2. Formation of coloured complexes
    3. Low melting and boiling point
    4. High melting and boiling point
  18. Transition metals have a high enthalpy of atomization due to?
    1. Variable oxidation states
    2. Strong metallic bonding from unpaired d-electrons
    3. Large atomic radius
    4. High nuclear charge
  19. Atomic radii decrease across the transition series and then become almost constant due to?
    1. Balance of effective nuclear charge and screening effect
    2. Variable oxidation state
    3. Stability of atoms
    4. Pairing of d-orbitals
  20. Which property of transition metals decreases and then becomes almost constant across the series?
    1. Electronegativity
    2. Atomic radius
    3. Ionisation energy
    4. Melting point
  21. Which property makes transition metals good reducing agents?
    1. They are metals
    2. Low ionisation energy
    3. High electron affinity
    4. Variable oxidation states
  22. Which transition element has a fully filled d-orbital (d¹⁰) in its ground state?
    1. Zn
    2. Ti
    3. Sc
    4. Cr
  23. The general electronic configuration of transition metals is?
    1. (n−1)d¹⁻¹⁰ ns¹⁻²
    2. (n−1)d¹⁻¹⁰ ns¹⁻¹⁰
    3. (n)d¹⁻¹⁰ ns¹⁻¹⁰
    4. (n)d¹⁻¹⁰ ns¹⁻²
  24. Which of the following metals has the strongest metallic bonding?
    1. W
    2. Zn
    3. Cd
    4. Cu
  25. Which of the following carbonates is the least thermally stable?
    1. CaCO₃
    2. BaCO₃
    3. BeCO₃
    4. MgCO₃
  26. BeO and MgO are sparingly soluble in water mainly because of?
    1. High basic property
    2. Covalent bonds
    3. Coordinate structure
    4. High lattice energy
  27. Which of the following has the lowest ionization energy?
    1. Alkali metals
    2. Inert gases
    3. Halogens
    4. Alkaline earth metals
  28. Which of the following has the highest melting point among the sodium halides?
    1. NaCl
    2. NaF
    3. NaBr
    4. NaI
  29. Which of the following metals is not normally obtained by the electrolytic method?
    1. Na
    2. Mg
    3. K
    4. Li
  30. Which hydrocarbon has the highest boiling point?
    1. Methane
    2. Ethene
    3. Octane
    4. Butane
  31. Which of the following is most reactive?
    1. Alkane
    2. Alkene
    3. Alkyne
    4. Cycloalkane
  32. Alkenes mainly undergo which type of reaction?
    1. Substitution
    2. Elimination
    3. Addition
    4. Oxidation
  33. Which characteristic reaction do alkanes mainly undergo (apart from combustion)?
    1. Addition
    2. Polymerisation
    3. Substitution
    4. Elimination
  34. Which hydrocarbon is used for ripening fruit?
    1. Methane
    2. Ethene
    3. Ethyne
    4. Propene
  35. Addition of H₂ to ethene in the presence of a catalyst gives?
    1. Ethanol
    2. Ethane
    3. Ethyne
    4. Ethanal
  36. The polymerization of ethylene gives?
    1. Polyethylene
    2. Polypropylene
    3. Polystyrene
    4. Polyvinyl chloride
  37. The polymerization of propylene gives?
    1. Polyethylene
    2. Polypropylene
    3. Polystyrene
    4. Polyvinyl chloride
  38. Polyethylene is a polymer of?
    1. Ethene
    2. Ethyne
    3. Ethane
    4. Ethanonitrile
  39. CH₃–CH₂–CH=CH₂ is named?
    1. But-1-ene
    2. But-2-ene
    3. Butane
    4. But-3-ene
  40. CH₂=CH–CH=CH₂ is named?
    1. Buta-1,3-diene
    2. But-4-diene
    3. But-1,3-diene
    4. Butane
  41. Which test differentiates alkanes from alkenes?
    1. Litmus test
    2. Bromine water test
    3. Flame test
    4. Benedict's test
  42. Which of the following reacts with alkynes?
    1. Alcohol
    2. Water
    3. Sodium metal
    4. All of the above
  43. Which of the following are derivatives of alkanes?
    1. Amines and alcohols
    2. Haloalkanes and alkanonitriles
    3. Ethers and esters
    4. Aldehydes and ketones
  44. Successive members of a homologous series exhibit the following: I. Differ by CH₂ II. Differ by a molecular mass of 14 III. Differ by CH₃ IV. Same general formula
    1. I, II, III
    2. II, III, IV
    3. I, II, IV
    4. All of the above
  45. Cyclohexanol is what type of alcohol?
    1. Primary
    2. Secondary
    3. Tertiary
    4. Aromatic
  46. The dehydration of an alcohol is what type of reaction?
    1. Substitution
    2. Elimination
    3. Addition
    4. Oxidation
  47. How can alcohol be prepared?
    1. Reduction of alkenes
    2. Reduction of aldehydes
    3. Both
    4. None
  48. The conversion of octanol to octane is by?
    1. Oxidation
    2. Substitution
    3. Elimination
    4. Reduction
  49. Methanol is more soluble in water than 1-butanol because?
    1. Methanol has a much smaller non-polar hydrocarbon part compared with its polar –OH group
    2. Methanol cannot form hydrogen bonds
    3. Methanol has a higher molar mass
    4. Methanol is ionic
  50. Hexanol is water insoluble but glucose is miscible because?
    1. Hexanol is polyhydric
    2. Carbon to hydrogen ratio is lower in hexanol
    3. Carbon to hydrogen ratio is lower in glucose
    4. Glucose is polyhydric
  51. The hydrogen bonding in low molecular weight alcohols results in?
    1. High boiling point
    2. Low boiling point
    3. Immiscibility
    4. Low dissolution
  52. Dehydration of C₆H₁₃OH produces?
    1. C₆H₁₀
    2. C₆H₁₂ + H₂O
    3. C₆H₁₃
    4. C₆H₁₄
  53. The reaction of cyclopropanol with sodium dichromate gives?
    1. Cyclopropanone
    2. Cyclopropanal
    3. Cyclopropane
    4. Propanoic acid
  54. Oxidation of cyclopentanol gives?
    1. Pentanal
    2. Cyclopentanone
    3. Pentanoic acid
    4. Pentanol
  55. Ethers have the general formula:
    1. RCOOH
    2. RCOX
    3. ROR'
    4. RCOR'
  56. What is the IUPAC name of CH₃OCH₂CH₃?
    1. Ethoxyethane
    2. Methoxyethane
    3. Methoxymethane
    4. Ethoxymethane
  57. Methyl phenyl ether is an example of?
    1. Aromatic ether
    2. Cyclic ether
    3. Simple ether
    4. Aliphatic ether
  58. Which functional group is made up of a carbonyl group and an alkoxy group?
    1. Ester
    2. Carboxylic acid
    3. Amide
    4. Amine
  59. Ethers are known for being?
    1. Solvent
    2. Solute
    3. Solution
    4. Catalyst
  60. Which families of organic compounds contain carbonyl groups?
    1. Alcohol, amides, esters, alkanoic acids
    2. Alkanones, alkanamides, esters, alkanoyl halides
    3. Ethers, ketones, alcohols, amines
    4. Aldehydes, ethers, alcohols, esters
  61. Carboxylic acids are more acidic than alcohols mainly due to?
    1. Resonance stabilization of the carboxylate anion
    2. High electronegativity of oxygen
    3. Electron withdrawing group
    4. Hydrogen bonding
  62. Decarboxylation of ethanoic acid gives?
    1. Methane
    2. Ethane
    3. CO₂ only
    4. Propane
  63. Decarboxylation of C₆H₁₃COOH gives?
    1. Cyclohexane
    2. Glucose
    3. Hexane
    4. Benzene
  64. Hydrolysis of C₆H₅COOCH(CH₃)₂ gives which alcohol?
    1. Butanol
    2. Propan-1-ol
    3. Isopropanol (propan-2-ol)
    4. Ethanol
  65. Pentan-1-ol is oxidised completely and the product is reacted with propan-2-ol. What is the end product?
    1. Isopropyl pentanoate
    2. Pentyl pentanoate
    3. Propyl pentanoate
    4. None of the above
  66. Arrange the following in increasing order of priority for naming:
    1. COR < CHO < CONH₂ < COOH
    2. COOH < CHO < CONH₂ < COR
    3. CHO < COR < CONH₂ < COOH
    4. CONH₂ < COR < CHO < COOH
  67. Based on the order of priority, for a compound containing CN, NH₂, OH and CHO groups, which serves as the principal functional group?
    1. Nitrile
    2. Amine
    3. Alkanal
    4. Alcohol
  68. Which of these is not a functional group?
    1. A single C–C covalent bond
    2. Hydroxyl group
    3. Carboxylic group
    4. Alkene
  69. Which of the following is not a property of a functional group?
    1. Atom
    2. Covalent bond
    3. Methyl or methylene group
    4. Ions
  70. What is the IUPAC name for tetramethylmethane?
    1. 2,2-dimethylpropane
    2. 2-methylbutane
    3. Neopentane
    4. 2,2-dimethylbutane
  71. What is the IUPAC name for the tert-butyl group?
    1. 2-methylpropane
    2. 1-methylpropane
    3. 1,1-dimethylethyl
    4. 2-methylpropyl
  72. Which of the following is tert-butyl?
    1. Dimethylethyl
    2. Isopropyl
    3. 1,1-dimethylethyl
    4. Trimethylmethyl
  73. What is the IUPAC name of ethyl dimethyl methanol (the 'carbinol' name)?
    1. 2-methylbutan-2-ol
    2. 2-methylbutan-1-ol
    3. 3-methylbutan-2-ol
    4. 2-ethylpropan-2-ol
  74. What is the condensed formula for 4-bromo-2,2,3-trimethylpent-3-enoic acid?
    1. CH₃C(Br)=C(CH₃)CH(CH₃)COOH
    2. CH₃C(Br)C(CH₃)C(CH₃)₂COH
    3. CH₃CH(Br)C(CH₃)=C(CH₃)₂COOH
    4. CH₃C(Br)=C(CH₃)C(CH₃)₂COOH
  75. What is the structure of 2,3-dimethylpent-3-enoic acid?
    1. CH₃CH=C(CH₃)CH(CH₃)COOH
    2. CH₃CH₂C(CH₃)=C(CH₃)COOH
    3. CH₃C(CH₃)=C(CH₃)CH₂COOH
    4. CH₃CH₂CH(CH₃)CH(CH₃)COOH
  76. What is the IUPAC name of CH₃COCH₃?
    1. Propan-1-one
    2. Propanal
    3. Propan-2-one
    4. Ethanone
  77. What is the IUPAC name of CH₃CH(OH)CH₃?
    1. Propan-1-ol
    2. Butan-2-ol
    3. Propan-2-ol
    4. Methylethanol
  78. What is the IUPAC name of (CH₃)₃COH?
    1. Butan-1-ol
    2. Butan-2-ol
    3. 2-methylpropan-2-ol
    4. 2-methylpropan-1-ol
  79. What is the IUPAC name of CH₃COOCH₂CH₃?
    1. Ethyl methanoate
    2. Methyl ethanoate
    3. Ethyl ethanoate
    4. Propyl methanoate
  80. What is the IUPAC name of CH₃CH(CH₃)CH₂COOH?
    1. 3-methylbutanoic acid
    2. 2-methylbutanoic acid
    3. 2-methylpropanoic acid
    4. 3-methylpropanoic acid
  81. Which of the following is a secondary amine?
    1. Methylamine
    2. Diethylamine
    3. Trimethylamine
    4. Ethylamine
  82. What is the IUPAC name of isopropyl pentanoate?
    1. 1-methylethyl pentanoate
    2. 2-methylpropyl pentanoate
    3. Propan-2-yl pentanoate
    4. Isopropyl butanoate
  83. What is the correct IUPAC name for CH₃COCH₂CH₃?
    1. Butan-2-one
    2. Butanal
    3. Butan-1-one
    4. Butan-2-ol
  84. What is the correct IUPAC name for a cyclohexane ring carrying a –C₃H₇ (propyl) group?
    1. Propylcyclohexane
    2. Cyclohexylpropane
    3. Hexylpropane
    4. Propylcyclohexene
  85. Identify the correct IUPAC nomenclature for the organic structure shown in the image.
    1. 1,3-dichloro-2-methylhept-3-ene-5-yne
    2. 5,7-dichloro-6-methylhept-4-ene-2-yne
    3. 2,3-dichloro-3-methylhept-3-ene-5-yne
    4. 1,6-dichloro-5-methylhept-3-ene-2-yne
  86. What is the correct IUPAC name for the given skeletal structure?
    1. 2-ethyl-4-methylpent-1-ene
    2. 3-methylene-4-methylhexane
    3. 3-methylene-5-methylhexane
    4. 5-methyl-2-ethylpent-1-ene
  87. Provide the correct IUPAC nomenclature for the molecule marked as '2', with the condensed formula CH₃COCH₂CH₃.
    1. Butanal
    2. Butan-2-one
    3. Pentan-2-one
    4. Propanone
  88. What is the correct IUPAC name for the cycloalkane derivative marked as '3' in the image?
    1. Propylcyclopentane
    2. Cyclopentylpropane
    3. Pentylcyclopropane
    4. 1-propylcyclopentene

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