Organic Chemistry Core Concepts Quiz
142 questions · Chemistry
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1. Which type of functional group makes organic molecules more hydrophilic?
2. Why is the carboxyl group (COOH) hydrophilic?
3. What is the general formula for alkanes?
4. What type of carbon-carbon bonds do alkanes contain?
5. What is the key difference between cis and trans isomers?
6. In alkyl halide nomenclature, what is the carbon bonded to the halogen called?
7. What are the two major reaction types that alkyl halides undergo?
8. Why are alkyl halides excellent electrophiles?
9. In an elimination reaction of an alkyl halide, what is removed to form an alkene?
10. Why don't alcohols undergo SN2 reactions as readily as alkyl halides?
11. How can alcohols be made more reactive in substitution reactions?
12. What makes epoxides particularly reactive compared to other ethers?
13. What distinguishes alkenes from alkanes?
14. Why are alkenes more reactive than alkanes?
15. What is the general formula for alkynes?
16. What suffix is used for naming alkynes?
17. A 1-alkyne is referred to as what type of alkyne?
18. What is the common name for ethyne (HC≡CH)?
19. Do alkynes show cis-trans isomerism?
20. What is the relationship between NMR signal intensity and sample concentration?
21. If benzene and cyclohexane are present in equal molar amounts, which will give a stronger NMR signal?
22. What are the three phases of radical chain reactions?
23. What typically occurs during the initiation phase of a radical reaction?
24. What conditions often promote radical initiation?
25. What happens during chain termination?
26. When does conjugation occur?
27. Why are allylic carbocations particularly stable?
28. What distinguishes conjugated dienes from non-conjugated dienes?
29. Why are conjugated dienes more stable than non-conjugated dienes?
30. What do resonance structures represent?
31. In resonance structures, what remains the same?
32. Which arrow symbol is used to connect resonance structures?
33. Which resonance structure is typically more stable?
34. What type of mechanism do electrophilic aromatic substitution reactions follow?
35. What is the intermediate formed in electrophilic aromatic substitution called?
36. Which step is rate-determining in electrophilic aromatic substitution?
37. What drives the second step (deprotonation) in EAS reactions?
38. What geometric arrangement is found around the carbonyl carbon in carboxylic acids?
39. Why are carboxylic acids much more acidic than alcohols?
40. In the acetate ion, how is the negative charge distributed?
41. Why do carboxylic acids have higher boiling points than similar alcohols?
42. What type of hybridization does the carbonyl carbon have?
43. Why is the carbonyl carbon electrophilic?
44. What is the typical reaction pattern for carbonyl compounds with nucleophiles?
45. Which resonance structure explains carbonyl reactivity?
46. What type of bonds are formed when atoms share electrons unequally?
47. Which orbital hybridization results in linear geometry?
48. What is the bond angle in sp3 hybridized carbon?
49. According to the Brønsted-Lowry definition, an acid is:
50. What is the relationship between Ka and Kb for a conjugate acid-base pair?
51. Which factor stabilizes a conjugate base and increases acidity?
52. Which functional group is present in aldehydes?
53. What distinguishes ketones from aldehydes?
54. Which functional group characterizes amines?
55. What type of isomerism do alkanes exhibit?
56. Which alkane has the highest boiling point?
57. What is a chiral center?
58. Enantiomers have identical properties except for:
59. How many stereoisomers are possible for a compound with 2 chiral centers?
60. What determines the position of equilibrium in an organic reaction?
61. What is the relationship between activation energy and reaction rate?
62. What does a catalyst do in a reaction?
63. Which factors favor SN2 reactions?
64. What is the stereochemical outcome of SN2 reactions?
65. Which alkyl halide reacts fastest in SN1 reactions?
66. What is Zaitsev's rule?
67. Which base favors E2 elimination?
68. What is the stereochemistry requirement for E2 elimination?
69. Which reagent converts alcohols to alkyl chlorides?
70. What type of cleavage do ethers undergo under acidic conditions?
71. Which reagent opens epoxides under basic conditions?
72. What is Markovnikov's rule for HX addition to alkenes?
73. Which reaction converts alkenes to vicinal diols?
74. What is the product of alkene ozonolysis followed by workup?
75. What is the hybridization of carbons in a triple bond?
76. Which reagent converts terminal alkynes to ketones?
77. Why are terminal alkynes acidic?
78. What happens to primary alcohols upon oxidation with PCC?
79. Which reagent reduces aldehydes and ketones to alcohols?
80. What is the oxidation state change when an alkene is converted to an alkane?
81. What does the molecular ion peak represent in mass spectrometry?
82. Which functional group shows a characteristic C=O stretch around 1700 cm⁻¹ in IR?
83. What causes the broad O-H stretch around 3200-3600 cm⁻¹ in IR spectra?
84. What causes chemical shift differences in ¹H NMR?
85. Which protons are most deshielded in ¹H NMR?
86. What information does integration provide in NMR?
87. Which factor affects the selectivity of radical halogenation?
88. Why is radical bromination more selective than chlorination?
89. Which alkyl radical is most stable?
90. What is the key difference between 1,2- and 1,4-addition to conjugated dienes?
91. Which diene reacts faster in Diels-Alder reactions?
92. What type of reaction is the Diels-Alder reaction?
93. What is the bond length of C-C bonds in benzene?
94. Which rule determines aromaticity?
95. Why doesn't benzene undergo addition reactions like alkenes?
96. Which substituent is a strong activator and ortho/para director?
97. Why are halogens deactivating but ortho/para directing?
98. Which reaction is NOT a typical EAS reaction?
99. Which carboxylic acid derivative is most reactive toward nucleophiles?
100. What is the typical pKa range for carboxylic acids?
101. Which effect makes trichloroacetic acid much more acidic than acetic acid?
102. Which organometallic reagent is most reactive?
103. What is the typical workup for Grignard reactions?
104. Which carbonyl compound reacts slowest with nucleophiles?
105. What type of reaction occurs when aldehydes are treated with LiAlH4?
106. Which functional group is present in esters?
107. What distinguishes primary, secondary, and tertiary alcohols?
108. Which functional group is characteristic of nitriles?
109. What is the functional group present in acyl chlorides?
110. What is the HOMO?
111. Which molecular orbital concept explains why He2 doesn't exist?
112. What is the bond order of N2?
113. What is the most stable conformation of cyclohexane?
114. In chair cyclohexane, axial positions are:
115. What causes the higher energy of boat cyclohexane compared to chair?
116. What is a meso compound?
117. Fischer projections represent:
118. What is the relationship between (R)-2-chlorobutane and (S)-2-chlorobutane?
119. What splitting pattern would you expect for a methyl group adjacent to a CH2?
120. In 13C NMR, which carbon appears furthest downfield?
121. What does the base peak represent in mass spectrometry?
122. Which technique is best for determining molecular weight?
123. What is the requirement for a compound to be aromatic according to Hückel's rule?
124. Which compound is antiaromatic?
125. Why is phenol more acidic than cyclohexanol?
126. What is the orientation effect of the methoxy group (-OCH3) in EAS?
127. What is the product when acetone reacts with methylmagnesium bromide followed by H3O+?
128. Which carbonyl compound would react fastest with a nucleophile?
129. What type of reaction occurs when aldehydes react with 2 equivalents of alcohol under acidic conditions?
130. What is the product when a ketone reacts with a primary amine?
131. What intermediate is formed in SN1 reactions?
132. Which rearrangement can occur during SN1 reactions?
133. What determines the rate of SN2 reactions?
134. What is syn addition?
135. Which reaction gives syn addition to alkenes?
136. What is anti-Markovnikov addition?
137. Which factor does NOT affect acidity?
138. Why is HF a weaker acid than HCl in aqueous solution?
139. What makes carboxylic acids more acidic than alcohols?
140. What happens when secondary alcohols are oxidized?
141. Which reagent oxidizes primary alcohols to carboxylic acids?
142. What is the oxidation state of carbon in CH4?