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Orgo 1 resonance and arrow pushing flashcards

A study set of flashcards focused on resonance and arrow pushing in organic chemistry, ideal for college students preparing for exams.

Amelia2004·31 flashcards·31 questions

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What is resonance in organic chemistry?

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Resonance refers to the delocalization of electrons within a molecule, allowing for multiple valid Lewis structures.

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Quiz(31 questions)

Question 1 of 31

1. What does an arrow pushed from a lone pair to a bond typically indicate?

Terms in this Study Set(31)

Resonance Basics(16)

What is resonance in organic chemistry?

Resonance refers to the delocalization of electrons within a molecule, allowing for multiple valid Lewis structures.

True or False: Resonance structures differ only in the positions of atoms.

False. Resonance structures differ only in the positions of electrons.

Fill in the blank: Resonance stabilizes molecules by distributing ______ over multiple structures.

Charge.

How do resonance structures differ?

- Bonding arrangements - Electron placements - Formal charges

What is a resonance hybrid?

A resonance hybrid is the actual structure of a molecule, representing a blend of all possible resonance structures.

Cause → Effect: Resonance → ______

Increased stability of the molecule.

List factors that contribute to resonance stability:

- Number of resonance structures - Electronegativity of atoms - Charge distribution

How are resonance structures drawn?

- Same connectivity - Only electrons move - Double-check charges and octets.

True or False: All resonance structures have the same energy.

False. Some resonance structures are more stable than others.

Compare major and minor resonance contributors.

Major contributors have: - Fewer formal charges - Full octets - More covalent bonds.

What role does electronegativity play in resonance?

Electronegative atoms stabilize negative charges, making the resonance structure more favorable.

Identify a common example of resonance.

Benzene: it has alternating double bonds, represented by two resonance structures.

What is a key feature of resonance structures?

The total number of valence electrons remains the same.

Fill in the blank: Resonance allows molecules to be more ______ than predicted by a single structure.

Stable.

How does resonance affect acidity?

Resonance stabilization of the conjugate base increases acidity of the parent acid.

Example: Draw resonance structures for acetate (C2H3O2-).

- Draw two structures, one with double bond O and single bond O. - Include formal charges.

Arrow Pushing Techniques(15)

What is arrow pushing?

A method to show electron movement in reaction mechanisms, illustrating how bonds break and form.

True or False: Arrow heads indicate electron movement.

True. Arrow heads represent where electron pairs are moving, while tails show the starting point.

Fill in the blank: A double bond can be broken by _______.

moving an electron pair with an arrow to a nearby atom.

What do curved arrows represent?

Curved arrows illustrate the movement of electron pairs during chemical reactions.

Cause → Effect: Breaking a bond → ______.

Formation of new bonds or charge redistribution.

Compare nucleophiles and electrophiles.

- Nucleophiles donate electron pairs. - Electrophiles accept electron pairs.

What is a lone pair's role in reactions?

Lone pairs can be used to form bonds by pushing arrows to electrophiles.

True or False: Electrons can be pushed from a bond to a neighboring atom.

True. Electrons in a bond can be moved to an adjacent atom to form a new bond.

What indicates a nucleophilic attack?

An arrow starts from the nucleophile towards the electrophile.

Fill in the blank: An electrophile is an atom that ______.

lacks electrons and seeks to accept electron pairs.

Cause → Effect: Arrow pushing in a mechanism → ______.

Understanding the stepwise transformation of reactants to products.

What happens to electrons in a resonance structure?

Electrons are delocalized; moving arrows depict this electron delocalization.

True or False: Only bonds can be broken in a reaction.

False. Lone pairs can also participate in bond formation and breaking.

What is the first step in arrow pushing?

Identify the nucleophile and electrophile in the reaction.

Give an example of arrow pushing in a nucleophilic substitution.

In SN2, an arrow moves from the nucleophile to the carbon, displacing the leaving group.

Questions in this Study Set(31)

1. What does an arrow pushed from a lone pair to a bond typically indicate?

A.The lone pair forms a new bond.

B.The bond will break and release electrons.

C.The bond will become a double bond.

D.The lone pair will become a radical.

2. What is the primary purpose of resonance in molecules?

A.To stabilize molecular structures

B.To increase atom counts

C.To decrease molecular weight

D.To increase bond strengths

3. In a nucleophilic attack, what does the arrow represent?

A.Movement of electrons from the nucleophile to the electrophile.

B.Breaking of a bond within the nucleophile.

C.Formation of a leaving group.

D.Movement of electrons from the electrophile to the nucleophile.

4. True or False: Resonance structures can change the types of atoms present in a molecule.

A.True

B.False

C.Sometimes

D.Only in large molecules

5. Fill in the blank: A nucleophile is a species that ______.

A.accepts electron pairs.

B.donates electron pairs.

C.has a positive charge.

D.is always neutral.

6. Fill in the blank: Resonance can help a molecule to achieve a more ______ electron configuration.

A.Stable

B.Reactive

C.Volatile

D.Complex

7. Which of the following correctly describes an electrophile?

A.It is rich in electrons.

B.It has a positive charge.

C.It seeks to donate electrons.

D.It accepts electron pairs.

8. How do resonance structures primarily differ?

A.Electron positioning

B.Atom types

C.Molecular shape

D.Bond lengths

9. What occurs when a bond is broken as represented by arrow pushing?

A.Release of electrons.

B.Formation of a lone pair.

C.Creation of a new bond.

D.All of the above.

10. What defines a resonance hybrid?

A.A mixture of all resonance forms

B.The most stable resonance structure alone

C.A single Lewis structure

D.An average of the bond lengths

11. In arrow pushing, what does a curved arrow from one bond to another indicate?

A.Electron density is conserved.

B.Electrons are moving from one bond to another.

C.A bond is breaking.

D.A lone pair is being formed.

12. Cause → Effect: Multiple resonance structures lead to ______.

A.Higher stability of the molecule

B.Lower energy of the molecule

C.Increased reactivity

D.Decreased bond angles

13. True or False: Electrons can only move from bonds, not from lone pairs.

A.True

B.False

C.Only in resonance structures.

D.Only in substitution reactions.

14. Which factor does NOT enhance resonance stability?

A.Presence of formal charges

B.Number of resonance structures

C.Electronegativity of atoms

D.Charge distribution

15. Which of the following is NOT true about resonance structures?

A.They depict the delocalization of electrons.

B.They can involve the movement of electrons.

C.They always represent real, observable structures.

D.They are used to represent electron-rich or electron-poor sites.

16. When drawing resonance structures, what must be conserved?

A.The total number of valence electrons

B.The number of atoms

C.The molecular geometry

D.The bond angles

17. What is the effect of arrow pushing in a reaction mechanism?

A.It shows the final products only.

B.It illustrates the stepwise transformation of reactants.

C.It ignores the role of catalysts.

D.It cannot be represented visually.

18. True or False: All resonance structures are equally important.

A.True

B.False

C.Only in simple molecules

D.Depends on the molecule

19. When a lone pair pushes an arrow toward an electrophile, what is the expected outcome?

A.Bond formation with the electrophile.

B.Decreased electron density in the nucleophile.

C.Increased acidity of the nucleophile.

D.Formation of a leaving group.

20. What characterizes a major resonance contributor?

A.Fewer formal charges and full octets

B.More double bonds than single bonds

C.More atoms involved

D.Greater molecular weight

21. Which arrow shows the breaking of a bond?

A.An arrow pointing away from the bond.

B.An arrow pointing toward the bond.

C.A double-headed arrow.

D.An arrow with a dashed line.

22. How does electronegativity influence resonance structures?

A.It stabilizes negative charges

B.It increases bond length

C.It decreases molecular weight

D.It alters atom types

23. Fill in the blank: In an SN2 reaction, the nucleophile attacks the carbon, resulting in ______.

A.the leaving group departing.

B.the formation of a new bond.

C.no change to the carbon.

D.a rearrangement of the molecule.

24. Identify a common organic molecule that exhibits resonance.

A.Benzene

B.Methane

C.Ethanol

D.Propane

25. Which of the following best describes the role of a leaving group in arrow pushing?

A.It donates electrons to the nucleophile.

B.It is accepted by the electrophile.

C.It is formed when a bond breaks.

D.It stabilizes the nucleophile.

26. What remains constant when comparing resonance structures?

A.The total number of valence electrons

B.The overall charge of the molecule

C.The molecular shape

D.The bond angles

27. True or False: Arrow pushing can only be used in organic reactions.

A.True

B.False

C.Only in nucleophilic substitutions.

D.Only in resonance structures.

28. Fill in the blank: Resonance increases the ______ of a molecule compared to predictions from a single structure.

A.Stability

B.Reactivity

C.Complexity

D.Size

29. In an electrophilic addition reaction, what does an arrow from the double bond to the electrophile indicate?

A.Electron pair donation to the electrophile

B.Formation of a new double bond

C.Breaking of the double bond into single bonds

D.Movement of electrons to another nucleophile

30. How does resonance affect the acidity of a compound?

A.It increases the acidity of the parent acid

B.It decreases reactivity

C.It has no effect

D.It can make the compound insoluble

31. When drawing resonance structures for acetate (C2H3O2-), which feature is present?

A.One structure with a double bond O and a single bond O

B.All atoms in one position

C.Only one correct structure

D.No formal charges present

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Orgo 1 resonance and arrow pushing flashcards

Quiz(31 questions)

Terms in this Study Set(31)

Resonance Basics(16)

Arrow Pushing Techniques(15)

Questions in this Study Set(31)

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