3.15: Quiz 3A
- Page ID
- 19270
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- Clearly indicate true (T) or false (F) for the following statements (2 pts each):
_____ | HO– is a stronger base than –NH2 |
_____ | A Lewis acid is a compound that accepts a share in a pair of electrons. |
- Multiple Choice: (2 pts each)
Which of the following molecules has a conjugated pi system?
Which of the following statements are correct concerning delocalized electrons?
- Electrons do not belong to a single atom.
- Electrons are not confined to a bond between two atoms
- Electrons are shared by three or more atoms
- A and B
- A, B and C
The delocalized π system in benzene is formed by a cyclic overlap of 6 _______ orbitals.
- s
- p
- sp
- sp2
- sp3
Which of the following statements is incorrect about benzene?
- All of the carbon atoms are sp hybridized
- It has delocalized electrons
- The carbon-carbon bond lengths are all the same
- All six atoms lie in the same plane
Which of the following compounds is not a Lewis base?
- NH3
- BF3
- CH3OCH3
- CH3OH
Which arrow is used to represent two contributors in a resonance hybrid?
- (6 pts) Consider the following two compounds (A and B) and circle which compound will have the highest boiling point. Briefly explain your answer, including the intermolecular forces for each.
- Delocalized electrons and resonance (11 pts total)
- Circle any of the following compounds that have a nitrogen atom with delocalized electrons.
- For each pair of resonance structures shown below (A and B), circle which resonance contributor makes a greater contribution to the resonance hybrid. Briefly explain your answer.
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- (4 pts) Which compound (A or B) is a stronger acid? Provide a brief explanation for your answer.
- (4 pts) Lactic acid (also know as milk acid) has two acidic protons (A and B). Explain which proton is more acidic and draw the conjugate base that will result upon deprotonation.
- (6 pts) The following molecule has an acidic proton. Draw the conjugate base for this molecule and then show why this molecule is acidic by drawing a relevant resonance structure.