1. Which of the following compounds is an aromatic compound? A. C₆H₆ B. CH₃CH₂Cl C. C₂H₅OH D. CH₃CH₂OH
2. Which of the following amines is most basic? A. Aniline B. Methylamine C. Dimethylamine D. Tertiary amine
3. Why is it important to use a hot solvent when dissolving a compound in recrystallization? A. It allows the impurities to dissolve B. It allows the compound to dissolve more easily C. It increases the boiling point D. It removes any impurities present
4. Which of the following is the function of tRNA in protein synthesis? A. Carry genetic information B. Translate genetic information into proteins C. Carry amino acids to the ribosome D. Store genetic information
5. What is the product of the reaction between an amine and an alkyl halide? A. Amine salt B. Amide C. Ester D. Alcohol
6. Which of the following is true about phenols? A. They are weak acids B. They are strong bases C. They contain an -OH group attached to a benzene ring D. They do not react with bases
7. Which of the following compounds exhibits both optical and geometrical isomerism? A. 2-Butene-1-ol B. 1-Butene C. 2-Butene D. Methanol
8. Which of the following is an example of positional isomerism? A. 1-bromopropane and 2-bromopropane B. Methanol and ethanol C. Propane and butane D. Ethene and propene
9. What is the purpose of using activated charcoal during recrystallization? A. To increase solubility B. To remove color impurities C. To decrease the boiling point D. To lower the melting point
10. Which of the following is true about alkynes? A. They contain one or more triple bonds B. They are saturated hydrocarbons C. They are less reactive than alkenes D. They do not undergo addition reactions
11. Which of the following is the IUPAC name for the compound CH₃CH₂CHO? A. Propanal B. Butanal C. Ethanol D. Acetone
12. In a substitution reaction of haloalkanes, the halogen atom is replaced by: A. Hydrogen B. Methyl group C. Hydroxyl group D. Chlorine
14. Which of the following is an example of an essential amino acid? A. Glycine B. Alanine C. Leucine D. Glutamic acid
15. What is the main reason for using solvent-solvent extraction? A. To separate compounds based on boiling points B. To separate compounds based on solubility differences C. To remove insoluble impurities D. To remove color impurities
16. Which of the following is a key function of vitamins in the body? A. Provide energy B. Help regulate metabolic processes C. Store genetic information D. Form proteins
17. Which of the following is the correct representation of a structural isomer? A. Compounds with the same molecular formula but different structures B. Compounds with the same functional group C. Compounds with the same physical properties D. Compounds that can be interconverted by heat
18. The IUPAC name of (CH₃)₃C–CH₂–CH₃ is: A. 2,2-dimethylbutane B. 3,3-dimethylbutane C. 2-methylpentane D. 2,2-dimethylpropane
19. Which of the following is the most reactive aldehyde towards nucleophilic addition? A. Methanal B. Acetone C. Benzaldehyde D. Butanal
20. Which of the following is the IUPAC name for CH₃CH₂OCH₃? A. Methylethanol B. Methylether C. Ethyl methyl ether D. Methylmethanol
21. Which of the following types of hydrocarbons are unsaturated? A. Alkanes B. Alkenes C. Alkynes D. Both B and C
22. Which of the following is true for alkanes? A. They contain double bonds B. They are saturated hydrocarbons C. They are unsaturated hydrocarbons D. They contain a triple bond
23. What is the IUPAC name of the compound CH3-CH2-C≡CH? A. Butyne B. Propyne C. Ethene D. Pent-1-yne
24. Which reagent is used to differentiate between aldehydes and alcohols? A. Tollens' reagent B. Sodium bisulfite C. Sodium hydroxide D. Bromine
25. Which of the following is the correct IUPAC name for C₆H₆NO₂? A. Nitrobenzene B. Aniline C. Benzene-1,2-diol D. Benzene
26. Which of the following reactions is a substitution reaction in haloalkanes? A. CH₃Cl + H₂O → CH₃OH + HCl B. CH₃Cl + NaOH → CH₃OH + NaCl C. C₂H₅Cl + NaOH → C₂H₅OH + NaCl D. All of the above
28. Which of the following statements is true for a compound in a stationary phase during chromatography? A. It moves with the solvent B. It stays fixed in place C. It dissolves in the mobile phase D. It evaporates
29. Which of the following is an example of a stereoisomer? A. cis-Butene and trans-Butene B. Butane and Isobutane C. 1-Butanol and 2-Butanol D. Acetone and Propan-2-one
31. What would be the effect of using too much solvent during recrystallization? A. It will dissolve too many impurities B. It will prevent the crystals from forming C. It will speed up the process D. It will reduce the solubility of the compound
32. What is the product when an aldehyde undergoes a reaction with sodium bisulfite? A. Addition product B. Hydrolysis C. Alcohol D. Acetate
33. Which of the following is the main product when a carboxylic acid reacts with an alcohol? A. Amines B. Aldehyde C. Ketone D. Ester
34. Which type of isomerism is exhibited by compounds with the same molecular formula but different connectivity of atoms? A. Geometrical isomerism B. Structural isomerism C. Optical isomerism D. Enantiomerism
35. Which of the following is a characteristic of enzymes? A. Enzymes are used up in reactions B. Enzymes increase the activation energy of reactions C. Enzymes catalyze biochemical reactions D. Enzymes are not specific in their action
36. Which of the following reactions is typical of alkynes? A. Nucleophilic substitution B. Addition C. Electrophilic addition D. All of the above
37. Which of the following is the process by which RNA is synthesized from DNA? A. Translation B. Replication C. Transcription D. Protein synthesis
38. Which of the following compounds is most reactive in nucleophilic substitution reactions? A. C₆H₆ B. C₆H₅NO₂ C. C₆H₅Cl D. C₆H₅OH
40. Which of the following is the basic unit of a protein? A. Fatty acid B. Amino acid C. Monosaccharide D. Nucleotide
41. Which of the following reactions leads to the formation of a carboxylic acid from an alcohol? A. Oxidation with K2Cr2O7 B. Reduction with NaBH4 C. Addition of HCl D. Nitration
42. The correct name of CH₃–O–CH₃ is: A. Methanol ether B. Dimethyl ether C. Methoxy methane D. Both B and C
43. What is the product of the reaction of an alkene with hydrogen chloride (HCl)? A. Alcohol B. Alkyl chloride C. Ether D. Alkane
44. Which type of isomerism is exhibited by compounds with the same molecular formula but different connectivity of atoms? A. Geometrical isomerism B. Structural isomerism C. Optical isomerism D. Enantiomerism
45. What is the correct IUPAC name for CH₃-CH₂-CH₂-COOH? A. Butanoic acid B. Propenoic acid C. Propanoic acid D. Acetic acid
47. Which of the following is true about the reduction of aldehydes? A. They form primary alcohols B. They form secondary alcohols C. They form tertiary alcohols D. They remain unchanged
48. In a nucleophilic addition reaction of aldehydes and ketones, what is added to the carbonyl group? A. Hydrogen B. Alkyl group C. Nucleophile D. Electrophile
49. Which of the following is the correct IUPAC name for CH₃COCH₂CH₃? A. Butan-2-one B. Ethanol C. Propanal D. Acetone