Video Solution: Write a more stable contributing structure for each of the f...

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Write a more stable contributing structure for each of the following. Use curved arrows to show how to transform the original Lewis formula to the new one. Be sure to specify formal charges, if any.

Video Transcript

So now here we've got a CH2, CH double bond, CH and then O Negative, right? So what we can do we continue we've got this double bond, we just had experience with this, we can go ahead and take one of these lone pairs kick it on to this bond and then kick electrons on to that bond, right? And now what we get is something looks very similar since we know our atoms don't actually move, we've got H2C, double bond, CH. Now, we've got single bond, CH. Now, our double bond to our O with two lone pairs and now we are in full bonding preference and we have no charges. Alright, let's move on.

Draw all of the resonance forms in complete skeletal form for the following molecule. Label the BEST resonance form.

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Which structures below are resonance forms of the carbocation shown in the box below?

a) III only

b) I and II only

c) I and III only

d) II and IV only

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Consider the molecule below:

a) Name the molecule. 

b) Draw another resonance contributor; use the correct arrows to show electron movement and the relationship between the contributors.

c) Draw the molecular dipole.

d) Draw a hydroxide ion and show how this ion could "attack" the molecule that you've named. Use the correct arrows to show electron attack and the equilibrium between the two species. 

e) Use the correct arrows to indicate the resonance contributor.

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Which of the following resonance forms best represent the molecule diazomethane?

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Draw two additional resonance structures for the following compound.

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Draw all of the reasonable resonance structures for the following molecule. 

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In the spaces provided, draw all the important resonance contributing structures of the indicated species. We have provided template molecules to help you do this more quickly. You must draw all pi bonds, all lone pairs of electrons and all formal charges on each of your structures. You DO NOT need to draw arrows to show electron movement.

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Amides are best represented as the hybrid of three contributing structures. Draw the second and third important contributing structures in the spaces provided, including all lone pairs and formal charges. For the two structures on the left in each problem, use arrows to indicate the movement of electrons to give the structures you drew. There is no need to draw any circles around any of these contributing strucures. You might want to read these directions again to make sure you know what we want

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Draw the important resonance structues for the following ion. Using arrows, show all electron movements. 

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Draw the important resonance structues for the following ion. Using arrows, show all electron movements. 

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Draw two major resonance forms for the following molecule.

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Consider the anion below, which is a resonance hybrid. Only one important resonance structure is given – each additional important resonance structure only has one atom with a nonzero formal charge. Several of the carbon atoms in the given resonance structure are labeled. Which of these carbon atoms has a  negative formal charge on it in  any of the additional important resonance structures that are not shown? Pick the one choice below which best answers this question.

A. I only

B. II only

C. III only

D. IV only

E. I and III

F. II and IV

G. I and II

H. III and IV

I. I, II, III, and IV

J. None of these

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Which choice best describes the relationship that exists between the pair of structures?

A. Identical 

B. Constitutional isomers

C. Resonance structures 

D. No relationship exists

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Which choice best describes the relationship that exists between the pair of structures?

A. Identical

B. Constitutional isomers

C. Resonance structures

D. No relationship exists

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What is the total number of valence electrons that should be shown explicitly as bonding pairs and/or lone pairs in each contributing resonance structure of HCO 3– ?

A. 24

B. 25

C. 26

D. 27

E. 28

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Starting from the structure below, draw three (3) additional resonance forms that are also  more significant contributors. Clearly circle the  most important resonance form. 

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Draw  three  other important resonance contributors for the molecule below.

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Which pair consists of resonance structures?

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Onto which of the numbered atoms in the following structure can the negative charge be moved by drawing resonance structures?

a) 1, 3, 5 only

b) 2, 4, 6 only

c) 2, 4, 6, 8

d) 1, 3, 5, 7

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Draw the three formal resonance structures of the carbonate ion  (CO 32-) below.

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What is the definition of a resonance structure?

a) Compounds with the same molecular formula

b) Compounds with different carbon frameworks

c) Structues that differ only in the placement of pi and nonbonding electrons

d) Structures that differ only in the locations of bonds

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Draw as many resonance structures as you can for the following compounds (Do not draw the same resonance structure twice). Circle the weaker base, and briefly justify your answer. 

 

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Identify the false statement

(A) p molecular orbitals are formed by overlap of p atomic orbitals.

(B) Orbitals are mathematical functions describing the energy of an electron in an atom.

(C) Contributing structures are in equilibrium with each other.

(D) Contributing structures have the same arrangement of atoms but a different arrangement of electrons.

(E) Functional groups are the sites of greatest reactivity in an organic molecule. 

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Draw two resonance structures for the species below.

 

 

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Draw in the appropriate arrows for the following resonance structures. 

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Which pair represents resonance structures?

a. I

b. II

c. III

d. IV

e. More than one of the above

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Which is (are) correct resonance structure(s) for the following organic compound:

a. I

b. II and III

c. I and II

d. All of the above

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Which is (are) correct resonance structure(s) for the following organic compound:

a. I

b. II and III

c. I and III

d. All of the above

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