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Exam 1: Structure and Bonding

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Question 21

Multiple Choice

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Which of the following statements about resonance structures is not true?

A) There is no movement of electrons from one form to another.
B) Resonance structures are not isomers.
C) Resonance structures differ only in the arrangement of electrons.
D) Resonance structures are in equilibrium with each other.

E) None of the above
F) All of the above

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Question 22

Multiple Choice

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Which of the following molecules are constitutional isomers? $\begin{array} { c c c c } \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { OH } & \mathrm { CH } _ { 3 } \mathrm { CH } ( \mathrm { OH } ) \mathrm { CH } _ { 3 } & \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OCH } _ { 3 } & \mathrm { CH } _ { 3 } \mathrm { COCH } _ { 3 } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}$

A) I, II, IV
B) II, III, IV
C) I, III, IV
D) I, II, III

E) A) and B)
F) All of the above

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Question 23

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Which of the following compounds are non-polar? $\begin{array} { c c c c } \mathrm { CO } _ { 2 } & \mathrm { NH } _ { 3 } & \mathrm { H } _ { 2 } \mathrm { O } & \mathrm { BCl } _ { 3 } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}$

Convert the following skeletal structure to a condensed structure.

Determine the electron geometry around the indicated atom in each species.

What is the formal charge of carbon in carbon monoxide (CO) when drawn with a triple bond?

Which molecule has the greatest difference in electronegativity (E) between the two different elements?

Which of the following Lewis structures is correct?

Which of the following is a resonance structure of the compound below?

Which atomic orbitals overlap to form the C-H  bonding molecular orbitals of acetylene, C₂H₂?

Which of the following is the appropriate conversion of (CH₃) ₂CHCH₂CHClCH₃ to a skeletal structure?

What is the hybridization of the nitrogen atom in the ammonium cation, NH₄⁺?

How many constitutional isomers are there for a molecule having the molecular formula C₂H₄Cl₂?

Rank the following in order of decreasing importance as contributing structures to the resonance hybrid of formaldehyde, H₂CO.

Which of the following molecules contain both covalent and ionic bonds? $\begin{array} { c c c c } \mathrm { NaCl } & \mathrm { NH } _ { 4 } \mathrm { OH } & \mathrm { CH } _ { 3 } \mathrm { OH } & \mathrm { MgCO } _ { 3 } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}$

What is the ground-state electronic configuration of a fluorine atom?

Which of the following molecules has polar covalent bonds?

What is the ground-state electronic configuration of a carbon atom?

Which compound contains the most polar bond? $\mathrm { CH } _ { 3 }$ $\begin{array} { c c } \mathrm { CH } _ { 3 } \mathrm { OH } & \mathrm { CH } _ { 3 } \mathrm { Cl } \end{array}$$\mathrm { CH } _ { 3 } \mathrm { NH } _ { 2 }$ I $\quad\quad\quad\quad$ II $\quad\quad\quad$ III $\quad\quad\quad$ IV

Which of the following Lewis structures is correct?