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| 1 |
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Q:
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Toluene is treated with excess concentrated nitric acid, HNO3. Given that CH3 is an ortho/para director, which of the following best describes the product of the reaction? |
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Tags:
Miscellaneous Organic Chemistry | |
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| 3 |
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Q:
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In the compound below, the two groups with the double-bonded oxygen atoms are which functional group?
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A
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carboxyl |
B
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carbonyl |
C
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ester |
D
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ether |
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Tags:
Miscellaneous Organic Chemistry | |
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| 6 |
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Q:
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A double replacement reaction occurs in a beaker between reagent X and reagent Y. It is found that water is formed in the reaction. Which of the following cannot be a potential reagent in the reaction? |
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A
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HCl |
B
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NaOH |
C
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MgCl2 |
D
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All of the above are potential reagents |
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Tags:
Chemistry Laboratory Techniques | Miscellaneous Organic Chemistry | |
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| 8 |
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Q:
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Given the two benzaldehyde derivatives below, which one will react faster (at the carbonyl carbon) with a nucleophile?
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A
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The left molecule because the fluoro group is electron-withdrawing, making its carbonyl carbon less electrophilic for addition by a nucleophile
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B
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The left molecule because the fluoro group is electron-donating, making its carbonyl carbon less electrophilic for addition by a nucleophile
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C
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The right molecule because the fluoro group is electron-withdrawing, making its carbonyl carbon more electrophilic for addition by a nucleophile
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D
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The right molecule because the fluoro group is electron-donating, making its carbonyl carbon more electrophilic for addition by a nucleophile
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Tags:
Chemical Kinetics | Aldehydes and Ketones | Miscellaneous Organic Chemistry | |
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| 9 |
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Q:
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The nitrogen-containing reactant below (Reactant B) can act as a nucleophile in certain reactions. The reaction below is carried out in a pH = 4.5 buffer. This is because the pKa of the protonated carbonyl (Reactant A) is between -2 and -8, so there is a low concentration of this highly reactive electrophile at a pH of 4.5. If the pH is further lowered (from 4.5) in order to try and increase the concentration of this electrophile, which of the following correctly describes the likely counter-effect?
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A
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Increasing the acidity would cause less of Reactant B to become protonated (decreasing its nucleophilicity), and this would counteract the increase in electrophilicity of Reactant A.
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B
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Increasing the acidity would cause more of Reactant B to become protonated (decreasing its nucleophilicity), and this would counteract the increase in electrophilicity of Reactant A.
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C
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Increasing the acidity would cause more of Reactant B to become protonated and this would have no effect on the electrophilicity of Reactant A.
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D
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Increasing the acidity would have no effect on Reactant B and no effect on the electrophilicity of Reactant A.
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Tags:
Acid/Base Equilibria | Miscellaneous Organic Chemistry | Organic Chemistry Reactions | Molecular Structure | |
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| 11 |
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Q:
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A nucleophilic reaction to a carbonyl is considered neither an SN1 nor SN2 reaction because: |
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A
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no substitution occurs during nucleophilic addition to a carbonyl. |
B
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the reaction proceeds through an E1 or E2 mechanism instead. |
C
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the solvent for the reaction is not aqueous. |
D
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the solvent for the reaction is not polar. |
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Tags:
Miscellaneous Organic Chemistry | Organic Chemistry Reactions | |
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| 12 |
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Q:
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With respect to IR spectroscopy, a hydroxyl group typically contributes a:
I. narrow peak.
II. broad peak.
III. peak around 3300 cm-1.
IV. peak around 1600 cm-1. |
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A
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I and III |
B
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I and IV |
C
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II and III |
D
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II and IV |
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Tags:
Miscellaneous Organic Chemistry | |
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| 13 |
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Q:
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Meso compounds: |
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A
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do not contain stereocenters. |
B
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always contain at least one double bond. |
C
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may only contain a single chiral center. |
D
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never have optical activity. |
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Tags:
Miscellaneous Organic Chemistry | |
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| 14 |
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Q:
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The R enantiomer of a compound rotates light -8 degrees. A solution composed of 90% S enantiomer and 10% enantiomer would rotate light: |
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A
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-5.8 degrees. |
B
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-6.4 degrees. |
C
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6.4 degrees. |
D
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5.8 degrees. |
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Tags:
Miscellaneous Organic Chemistry | |
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| 15 |
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Q:
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Which of the following laboratory techniques would allow for separation of enantiomers? |
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A
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distillation |
B
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chiral chromatography |
C
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electrophoresis |
D
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affinity chromatography |
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Tags:
Miscellaneous Organic Chemistry | |
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| 17 |
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Q:
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A molecule is found to contain a S stereocenter. This implies: |
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A
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the molecule rotates light clockwise. |
B
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the molecule rotates light counterclockwise. |
C
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the molecule rotates light but the direction is unknown from this data. |
D
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nothing about the molecule's ability to rotate light. |
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Tags:
Miscellaneous Organic Chemistry | |
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| 18 |
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Q:
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cis-1,2-difluoroethene is also known as: |
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A
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(E)-1,2-difluoroethene. |
B
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(Z)-1,2-difluoroethene. |
C
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(R)-1,2-difluoroethene. |
D
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(S)-1,2-difluoroethene. |
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Tags:
Miscellaneous Organic Chemistry | |
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| 19 |
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Q:
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Which of the following reaction types is least likely for a tertiary alkyl halide? |
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A
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SN1 |
B
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SN2 |
C
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E1 |
D
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All of the above are equally unlikely |
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Tags:
Miscellaneous Organic Chemistry | |
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