Question 1

Which of the following is the best Lewis Structure for the IO₄^- ion? A) B) C) D)

Accepted Answer

Best Lewis Structures have all atoms with filled octet and the least charge separation. Iodine can expand its octet due to empty d-orbitals.

Question 2

What is the formal charge of Nitrogen in the following structure?  &#10;A) +2&#10;B) +1&#10;C) 0&#10;D) -1&#10;E) -2

Accepted Answer

Formal charge = valence electrons - bonds - of nonbonding electrons. Each lone pair = 2 nonbonding electrons.

Question 3

What is the formal charge of Oxygen in the following structure?  &#10;A) +2&#10;B) +1&#10;C) 0&#10;D) -1&#10;E) -2

Accepted Answer

Formal charge = valence electrons - bonds - of nonbonding electrons. Each lone pair = 2 nonbonding electrons.

Question 4

Which of the following are correct resonance structures of structure I?  &#10;A) A and B&#10;B) B, C and D&#10;C) A, B and D&#10;D) all of them&#10;E) none of them

Accepted Answer

Resonance structures involve the movement of electrons. You cannot move atoms and bonds or violate the octet rule when drawing resonance structures.

Question 5

What is the best resonance structure for structure I?  &#10;A) A&#10;B) B&#10;C) C&#10;D) D

Accepted Answer

Response A: This is a good resonance structure but not the best. The best resonance structure has all closed shells and no charge separation. If charges are present, negative charges should be on the most electronegative atoms and positive charges should be on the least electronegative atom. Here, the negative is on carbon, this is actually 2nd best resonance structure.
Response B: Correct!! This is the best resonance structure. The best resonance structure has all closed shells and no charge separation. If charges are present, negative charges should be on the most electronegative atoms and positive charges should be on the least electronegative atom.
Response C: This is NOT a good resonance structure. There is a violation of the octet rule. One of the carbons in the ring has 5 bonds.
Response D: This is a good resonance structure but not the best. The best resonance structure has all closed shells and no charge separation. If charges are present, negative charges should be on the most electronegative atoms and positive charges should be on the least electronegative atom. Here, there is an open octet, this is actually 3rd best resonance structure.

Question 6

What is the hybridization of the indicated atom in the following structure? A) sp³ B) sp² C) sp D) sp²d² E) none of the above

Accepted Answer

The answer of What is the hybridization of the indicated...

Question 7

What is the hybridization of the indicated atom in the following structure? A) sp³ B) sp² C) sp D) sp²d² E) none of the above

Accepted Answer

The answer of What is the hybridization of the indicated...

Question 8

What is the correct molecular orbital diagram for the following structure&#10;?&#10; &#10;A)  &#10;B)&#10; &#10;C)&#10; &#10;D)&#10; &#10;E)&#10;

Accepted Answer

Molecular orbital diagrams use lines to indicate sigma bonds and p-orbitals to indicate multiple bonds. An atom with a double bond is represented by a single pair of p-orbitals. An atom with a triple bond or a pair of double bonds is represented by a pair of p-orbitals. The pair of p-orbitals must be oriented at right angles to each other (i.e. One vertical and one horizontal as if on the × and Y axis of a coordinate system).

Question 9

What is the hybridization of the indicated atom in the following structure? A) sp³ B) sp² C) sp D) sp²d² E) none of the above

Accepted Answer

The answer of What is the hybridization of the indicated...

Question 10

What is the hybridization of the indicated atom in the following structure? A) sp³ B) sp² C) sp D) sp²d² E) none of the above

Accepted Answer

The answer of What is the hybridization of the indicated...

Question 11

Which of the following is the best, correct Lewis Structure for CH₂C(CH₃)CH₂CH₃? A) B) C) D)

Accepted Answer

The answer of Which of the following is the best,...

Question 12

Which of the choices is equivalent to CH₃CH₂CH(OH)CH₂CH₃? A) B) C₅H₁₁O C) D)

Accepted Answer

The answer of Which of the choices is equivalent to...

Question 13

Which is the correct bond-line formula for the following structure?&#10; &#10;A)&#10; &#10;B)&#10; &#10;C)&#10; &#10;D)&#10;

Accepted Answer

The answer of Which is the correct bond-line formula for...

Question 14

Which is the correct condensed formula for the following structure? A) CH₃CH₂CH(OH)CHCH₂CH₃ B) CH₃CH₂CH(OH)CH(CH₂CH₃)₂ C) CH₃CH₂(OH)CH(CH₂CH₃)CH₃ D) CH₃CH₂CH₂(OH)CH(CH₂CH₃)CH₂CH₃

Accepted Answer

The answer of Which is the correct condensed formula for...

Deck 1: The Basics