General Chemistry I — 2025oer Past Questions

Lagos State University CHM102: 47 questions.

Topics: Chemistry of alkanes, alkenes, alkynes, alcohols, ethers, amines, alkyl halides, nitriles, aldehydes, ketones, carboxylic acids, and derivatives, Nomenclature and functional group classes of organic compounds, Electronic theory in organic chemistry, Isolation, purification, and determination of organic compound structures

1. Alkyne can be identified by the following tests except:
   1. Bromine water
   2. Ammoniacal silver nitrate
   3. Acidified KMnO4
   4. Substitution of halogen
2. What type of reaction does alkynes undergo?
   1. Addition reaction
   2. Substitution reaction
   3. Hydrolysis of Nitriles
   4. All of the above
3. Reactions of alkynes are the following except:
   1. Grignard method
   2. Dehydration of alcohol
   3. Ozonolysis
   4. B and C
4. The following methods can be used to prepare alkanes:
   1. Reduction
   2. Oxidation of aldehydes and alkyl benzenes
   3. Hydrolysis of Nitriles
   4. All of the above
5. Reactions of alkynes are:
   1. Hydrohalogenation of alkyl halide
   2. Halogenation
   3. Hydration of alcohol
   4. All of them
6. Synthesis of alkane methods are:
   1. Corey-house method
   2. Wurtz method
   3. Grignard method
   4. All of them
7. The general formula for alkene is
   1. CnH2n+1
   2. CnH2n
   3. CnHn
   4. CnH2n-1
8. How many isomers can you obtain from C6H14?
   1. 3
   2. 5
   3. 2
   4. 4
9. Which of the following is the chemical structure of 3-chloro-2-methyl...
   1. 4
   2. 3
   3. 2
   4. 1
10. How many alkene product(s) is expected in the dehydrohalogenation of 3-bromo-2-methylbutane?
    1. 4
    2. 3
    3. 2
    4. 1
11. How many alkene product(s) is expected in the dehydration reaction of 3-methylhexan-3-ol?
    1. 1
    2. 2
    3. 3
    4. 4
12. Identify the products of the anti-Markovnikov orientation of the below addition reaction
    1. Elimination reaction
    2. Substitution reaction
    3. Displacement reaction
    4. Addition reaction
13. Hydrogenation, halogenation, ozonolysis of alkenes are classified as ______ reactions?
    1. Elimination reaction
    2. Substitution reaction
    3. Displacement reaction
    4. Addition reaction
14. A A
    1. Ozonolysis
    2. Markovnikov
    3. Hydration
    4. Anti-markovnikov
15. Identify the general molecular formula of cycloalkane:
    1. CnH2n + 2
    2. CnH2n - 2
    3. CnH2n
    4. All of the above
16. The type of hybridization that exist in alkenes is
    1. sp
    2. sp3
    3. sp2
    4. sp4
17. Which of the following classes of alkenes is least stable?
    1. Tetrasubstituted alkene
    2. Trisubstituted alkene
    3. Disubstituted alkene
    4. Monosubstituted alkene
18. The most important diacid is
    1. Maleic acid
    2. Adipic (hexanedioic) acid
    3. Capric acid
    4. Heptanedioic acid
19. The acid in diacid is used in the production of
    1. BAKALITE
    2. Polymer (nylon)
    3. Salt
    4. Monoacid
20. Which of these compounds would be the most acidic?
    1. Ethanol
    2. Ethanoic acid
    3. Chloroethanoic acid
    4. Dichloroethanoic acid
21. Oxidation of toluene will produce:
    1. Benzoic acid
    2. Benzene dioxid acid
    3. Methylbenzoic acid
    4. Toluene carboxylic acid
22. The carboxylic acid is a stronger acid than alkanols because the carboxylate ion is stabilized by
    1. Mesomeric effect
    2. Isomeric effect
    3. Resonance
    4. Equilibrium effect
23. The conversion of an aldehyde to an acid is effected through:
    1. Reduction reaction
    2. Disproportionation
    3. Oxidation reaction
    4. Saponification
24. What is the product of hydration of alkene?
    1. Aldehydes
    2. Carboxylic acids
    3. Ketone
    4. Aldehydes and Carboxylic acids
25. Two molecules of carboxylic acid are joined together to form a dimer through ______ bonding:
    1. Hydrogen
    2. Polar
    3. Covalent
    4. Electrovalent
26. Common names of some acids are derived from their sources, all except one of these acids are gotten from goat:
    1. Caproic acid
    2. Capric acid
    3. Caprylic acid
    4. Pelargonic acid
27. Propan-2-ol is an example of ---
    1. Primary alcohol
    2. Secondary alcohol
    3. Tertiary alcohol
    4. Phenols
28. The following methods can be used to prepare alcohol except
    1. Hydroboration
    2. Oxymercuration-demercuration
    3. Dehydration
    4. Addition of Grignard reagents to carbonyl groups
29. Which of the following alcohols would be oxidised to propan-2-one?
    1. Ethanol
    2. Propan-2-ol
    3. 2-methylpropan-2-ol
    4. Butan-1-ol
30. Classify this alcohol CH3CH2CH(OH)CH2CH(OH)CH3 as:
    1. Primary alcohol
    2. Secondary alcohol
    3. Tertiary alcohol
    4. Dihydric alcohol
31. Which of the following process is not used for synthesizing alcohol?
    1. Hydration of alkenes
    2. Reduction of ketones
    3. Ozonolysis
    4. Hydrolysis of esters
32. Which molecule is an example of a ketone?
    1. Ethanal
    2. Ethanoic anhydride
    3. Acetone
    4. Propanamide
33. Reduction of amide can form the following products:
    1. Alkane
    2. Alcohol dipole forces
    3. Alkene
    4. Alkyne
34. Why is sodium borohydride an important reagent in reducing a ketone?
    1. It is good for hydrolysis type reactions
    2. It is a good source of the hydride ion (H-)
    3. It can act as a base
    4. It can act as a free radical initiator
35. Benzoic acid, propanal, methylbutanoate and Butan-2-one are reduced to their respective alcohol using which of the reagents?
    1. Pt/H2
    2. LiAlH4
    3. KMnO4
    4. All of the above
36. Which class of compound is an example of a carbonyl compound?
    1. Alcohol
    2. Aldehyde
    3. Alkene
    4. Alkane
37. Which of the following is a tertiary alcohol?
    1. 1-phenylethanol
    2. Benzyl alcohol
    3. 2-phenylpropan-2-ol
    4. Phenol
38. What phenomenon determines the polarity reported in aldehydes and ketones?
    1. Hybridisation
    2. Isomerism
    3. Dipole moment
    4. Esterification
39. Aldehydes and ketones are soluble in water because they are hydrogen bond ---?
    1. Acceptor
    2. Oxidiser
    3. Donors
    4. Reducer
40. Reaction of carboxylic acids with red P and HI at 200°C will produce
    1. Thionyl halide
    2. Amine
    3. Alkane
    4. Alkyne
41. The following pair of reagent are used in Wolff-Kishner reduction of aldehydes and ketones to alkane
    1. Zn amalgam/HCl
    2. NH2-NH2/KOH
    3. AlCl3/HCl
    4. LiAlH4
42. What reagent is used to distinguish aldehydes and ketones from other functional groups?
    1. 2,4-Dinitophenylhydrazine
    2. EDTA
    3. Draggendorf
    4. Folin-Coultaeu
43. Arrange the boiling points of the following compounds in their ascending order: i. n-butane ii. 1-butene iii. Propanal iv. 1-propanol
    1. i, iii, ii, iv
    2. i, iv, ii, iii
    3. i, ii, iii, iv
    4. iv, ii, iii, i
44. Give the structure of 4,4-dimethylheptan-3-one
    1. Ethyl methyl ketone
    2. Ethyl propyl ketone
    3. Butyl Ethyl Ketone
    4. Heptyl ketone
45. Alkynes have the following bonds:
    1. A sigma bond and two pi bonds
    2. A pi bond and a sigma bond
    3. Two pi bonds and a sigma bond
    4. None of the above
46. What is the molecular formula of hexyne?
    1. CH3CH2CH2CH2C≡CCH3
    2. CH≡CCH2CH2CH3
    3. CH3CH2CH2CH2CH=CH2
    4. All of the above
47. What is homologous series?
    1. A series of compounds with CH2
    2. A series of compound with 14
    3. A series of compounds in which each preceding or succeeding member differs by CH2
    4. All of them

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