10 RC ORGANIC CHEMISTRY MOCK EXAM - PART 1

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Last updated 6:20 AM on 8/29/26
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50 Terms

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  1. What is the formal charge and oxidation state of carbon in CO2, respectively?


A. 0,-4 | B. 0,+4 | C. +4,-4 | D. +4,0 | E. None of the above.

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2. Which of the following is the example of the crystallization process?
A. Purification of alum | B. None of the given answers | C. Separation of gases from air | D. Purification of sea water | E. None of the above.
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3. For which compound are the empirical and molecular formulas the same? (I. C6H5COOH, II. C6H4(COOH)2, III. HOOCCOOH, IV. CH3COOH)
A. III | B. I | C. IV | D. II | E. None of the above.
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4. Which is the correct statement from the following?
A. Molecular spectra is more complicated than atomic spectra | B. Molecular spectra arises from the transition of an electron between the molecular energy levels | C. In molecular transitions, electronic, rotational and vibration transitions occurs | D. All of the given choices | E. None of the above.
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5. What hybrid orbitals are employed by carbon atoms 1, 2, and 3, respectively, in H3C-C≡N:?
A. sp3, sp, sp | B. sp2, sp2, sp | C. sp3, sp2, sp | D. sp3, sp2, sp2 | E. None of the above.
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6. How many sigma and pi bonds are shown in HO-CH2-CH=CH-C≡C-H?
A. 8 sigma and 7 pi bonds | B. 8 sigma and 3 pi bonds | C. 11 sigma and 3 pi bonds | D. 11 sigma and 4 pi bonds | E. None of the above
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7. Which is the formula for an alkyne?
A. C2H4 | B. C3H6 | C. C3H8 | D. C4H6 | E. None of the above.
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8. Which compound is an ester?
A. R-COOH | B. R-COOR' | C. R-CHO | D. R-OH | E. None of the above.
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9. Which of the following structures represents a molecule different from the others?
A. I | B. IV | C. II | D. III | E. None of the above.
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10. What is the molecular formula of 1,2-dimethylbenzene (xylene structure)?
A. C10H12 | B. C10H14 | C. C12H12 | D. C12H14 | E. None of the above.
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11. What is the correct IUPAC name of the carboxylic acid shown (6-methyl-5-oxo-3-heptenoic acid)?
A. 5-oxo-3-ecienoic acid | B. 6-methyl-5-oxo-3-heptenoic acid | C. 1-carboxy-5-methyl-2-hexen-4-one | D. 5-carbonyl-6-methylhexanoic acid | E. None of the above
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12. Dienes are the name given to compounds with
A. Exactly a double bond | B. Exactly a triple bond | C. Exactly two double bond | D. More than two double bond | E. None of the above.
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13. According to IUPAC rules, what is the name of propyl benzoate / phenyl propanoate?
A. Benzyl propanoate | B. Phenyl propanoate | C. Phenyl butanoate | D. Propanoyl benzene | E. Propyl benzoate
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14. Refer to the figure and select the best answer (3-isopropylcyclopentene).
A. 3-propylcyclopentene | B. 2-propylcyclopentene | C. 3-Isopropylcyclopentene | D. 2-Isopropylcyclopentene | E. None of the above.
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15. What is the IUPAC name for CH3CH2C(CH3)2CH2CH(CH3)2?
A. 3,3,5-trimethylhexane | B. 1,1,3,3-tetramethylpentane | C. 2,4,4-trimethylhexane | D. 1,1,3,3-tetramethylhexane | E. None of the above.
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16. What is the IUPAC name of the cyclic enone shown?
A. 3-Methylcyclohex-3-en-1-one | B. 5-Methylcyclohex-4-en-1-one | C. 1-Methylcyclohex-1-en-5-one | D. 2-Methylcyclohex-1-en-4-one | E. None of the above
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17. Which is an isomer of 1-butanol?
A. 1-propanol | B. butanone | C. 1-chlorobutane | D. diethyl ether | E. None of the above.
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18. What is the E/Z configuration of the alkene shown in the retained figure?
A. E-isomer | B. Z-isomer | C. cis-isomer | D. trans-isomer | E. None of the above.
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19. Which of the compounds shown are isomers? (1: CH3CH2OCH3, 2: CH3CH2OCH2CH3, 3: CH3CH2CH2OH, 4: CH2=CHOCH3)
A. 1 and 3 | B. 1 and 2 | C. 2 and 3 | D. 1 and 4 | E. None of the above.
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20. How many isomers have the formula C3H8O?
A. 2 | B. 3 | C. 4 | D. 5 | E. None of the above.
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21. How many toluene derivatives have the formula C7H7Cl?
A. 1 | B. 2 | C. 3 | D. 4 | E. None of the above.
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22. In which of the following pairs are the compounds diastereoisomers?
A. Pair A | B. Pair B | C. Pair C | D. Pair D | E. Pair E
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23. Which statement best describes the results of attempted separation by fractional distillation of the two isomers of 1,2-dichloroethene?
A. Isomer 1 boils at lower temp | B. Isomer 2 boils at lower temp | C. Cannot be separated due to same boiling point | D. Cannot be separated due to rapid interconversion | E. None of the above.
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24. A lab analyst has isolated a solid carboxylic acid of unknown formula from a medicinal herb. Which experiment will be most useful in assessing the purity?
A. Melting point | B. Titration with NaOH | C. Combustion analysis | D. UV-visible spectrophotometry | E. None of the above.
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25. What is the order of solubility in water of: 1. ethyl methanoate, 2. ethyl butanoate, 3. ethyl ethanoate, 4. ethyl propanoate?
A. 1>2>3>4 | B. 1>3>4>2 | C. 1>2>4>3 | D. 3>1>4>2 | E. None of the above.
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26. Of the following fatty acids, which has the lowest melting point?
A. Saturated acid | B. Monounsaturated (trans) | C. Monounsaturated (cis) | D. Diunsaturated | E. Triunsaturated
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27. Which among the following is not an example of hydrogen bond?
A. H2O | B. Liquid HCl | C. NH3 | D. CHCl3 | E. None of the above.
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28. When equal volumes of the following pairs of liquids are mixed thoroughly and allowed to stand, which pair is most likely to separate into two layers?
A. ethanol and methanol | B. carbon tetrachloride and methanol | C. hexane and pentane | D. carbon tetrachloride and hexane | E. None of the above.
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29. Which of the following compound has lower vapor pressure than ketones?
A. Alcohol | B. Alkanes | C. Aldehyde | D. Ether | E. None of the above.
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30. Which of the following is an alkane which can exhibit optical activity?
A. Neopentane | B. Isopentane | C. 3-Methylpentane | D. 3-Methylhexane | E. None of the above.
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31. Aniline, C6H5NH2 does not dissolve well in water. Which reagent could be used to increase its aqueous solubility?
A. 1M HCl | B. 1M NaOH | C. diethyl ether | D. toluene | E. None of the above.
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32. Which compound would have the lowest pKa aqueous solution?
A. Phenol, C6H5OH | B. Benzoic acid, C6H5COOH | C. Trichloroacetic acid, CCl3COOH | D. Formic acid, HCOOH | E. None of the above.
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33. Which compound has the highest vapor pressure at 25°C?
A. CH2CH2CH2CH2OH | B. CH3CH2CH2OCH3 | C. CH3CH2CH2CH2NH2 | D. (CH3)3COH | E. None of the above.
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34. Arrange amines I-III in decreasing order of boiling point. (I. CH3CH2CH2CH2NH2, II. CH3CH2N(CH3)2, III. CH3CH2CH2NHCH3)
A. II>III>I | B. I>III>II | C. I>II>III | D. III>II>I | E. II>I>III
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35. The solid alkane CH3(CH2)18CH3 is most soluble in which solvent?
A. CCl4 | B. CH3OH | C. H2O | D. CH3NH2 | E. HOCH2CH2OH
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36. The hydrolysis of alkyl halides by aqueous NaOH is best termed as:
A. Electrophilic substitution reaction | B. Electrophilic addition reaction | C. Nucleophilic addition reaction | D. Nucleophilic substitution reaction | E. None of the above.
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37. The reaction of phenoxide with ethyl bromide to give ethyl phenyl ether is an example of:
A. Elimination | B. SN1 | C. Electrophilic addition | D. Electrophilic aromatic substitution | E. SN2
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38. Which statement(s) about the labeled carbons in compound B are true?
A. Ca and Cb are quaternary | B. Cc is primary | C. Ca is quaternary | D. Cb is tertiary | E. Cc is primary, Ca is quaternary, and Cb is tertiary
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39. Name the process associated with acylation of benzene
A. Wittig reaction | B. Wurtz reaction | C. Wurtz fittig reaction | D. Debey Huckel reaction | E. Friedel craft reaction
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40. The reaction of carboxylic acids with alcohols catalyzed by conc. H2SO4 is called
A. Dehydration | B. Saponification | C. Esterification | D. Neutralization | E. None of the above.
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41. Which labeled C-H bond has the smallest bond dissociation enthalpy?
A. C-Ha | B. C-Hb | C. C-Hc | D. C-Hd | E. None of the above.
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42. Which reagent reacts readily with butanal (CH3CH2CH2CHO) but not with 2-pentanone (CH3CH2CH2COCH3)?
A. K2Cr2O7 in aqueous H2SO4 | B. I2 in aqueous NaOH | C. CH3MgBr in Et2O | D. NaBH4 in CH3OH | E. None of the above.
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43. Which of the following terms describes a useful method of carrying out NCCH2CH2CN -> HOOCCH2CH2COOH?
A. Reduction | B. Acylation | C. Hydrolysis | D. Alkylation | E. Esterification
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44. Which species shown is not an electrophile?
A. NO2+ | B. BH3 | C. (CH3)3C+ | D. NH3 | E. AlCl3
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45. Which intermediate is involved in the stereospecific reaction of alkene with CHCl3 + NaOH?
A. A carbocation | B. An ylide | C. A free radical | D. An alkyne | E. A carbene
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46. Which reaction-energy diagram is consistent with a three-step mechanism where product is more stable than reactant?
A. Diagram A | B. Diagram B | C. Diagram C | D. Diagram D | E. Diagram E
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47. The other name for branched chain alkanes is
A. Paraffins | B. Isoparaffins | C. Neoparaffins | D. Naphthenes | E. None of the above.
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48. The main components of natural gas are
A. methane and butane | B. methane and ethane | C. methane and isooctane | D. butane and isooctane | E. butane and octane
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49. When chlorine gas reacts with methane, the product formed is
A. CHCl | B. CH2Cl | C. CH3Cl | D. CH4Cl | E. None of the above.
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50. Which of the following hydrocarbon series are almost absent in crude petroleum?
A. Paraffins | B. Naphthenes | C. Aromatic | D. Olefins | E. None of the above.