Question 1

The C4-C5 carbon-carbon bond in the following molecule results from the overlap of which orbitals ( in the order C4-C5)?

Accepted Answer

A)  sp-sp2 
B)  sp-sp3 
C)  sp2-sp2 
D)  sp2-sp3 
E)  sp3-sp2 
A)  sp-sp2 
B)  sp-sp3 
C)  sp2-sp2 
D)  sp2-sp3 
E)  sp3-sp2 E

Question 2

Which of the following species is/are not a resonance form(s)of the species in the box?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  More than two of them are incorrect resonance forms. 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  More than two of them are incorrect resonance forms. B

Question 3

Which of the following species is/are not a resonance form(s)of the species in the box?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  More than two of them are incorrect resonance forms. 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  More than two of them are incorrect resonance forms. A

Question 4

Which of the structures below would be trigonal planar (a planar triangle)? (Electrical charges have been deliberately omitted. )

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  I and IV 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  I and IV

Question 5

In which molecule is the central atom sp3 hybridized?

Accepted Answer

A)  CH4 
B)  NH3 
C)  H2O 
D)  All of these 
E)  None of these 
A)  CH4 
B)  NH3 
C)  H2O 
D)  All of these 
E)  None of these

Question 6

Based on the VSEPR theory,which of the following would have a tetrahedral arrangement of electrons around the central atom?

Accepted Answer

A)  BH3 
B)  NO2  - 
C)  SiH4 
D)  CO3  2- 
E)  SO3 
A)  BH3 
B)  NO2  - 
C)  SiH4 
D)  CO3  2- 
E)  SO3

Question 7

What would be the spatial arrangement of the atoms of the ozone molecule (O3)?

Accepted Answer

A)  Linear 
B)  Angular 
C)  Trigonal planar 
D)  Trigonal pyramidal 
E)  Tetrahedral 
A)  Linear 
B)  Angular 
C)  Trigonal planar 
D)  Trigonal pyramidal 
E)  Tetrahedral

Question 8

What is the geometry of the C indicated with the arrow?

Accepted Answer

A)  tetrahedral  
B)  trigonal pyramidal  
C)  linear 
D)  bent 
E)  trigonal planar 
A)  tetrahedral  
B)  trigonal pyramidal  
C)  linear 
D)  bent 
E)  trigonal planar

Question 9

Which principle(s)or rule(s)must be used to determine the correct electronic configuration for carbon in its ground state?

Accepted Answer

A)  Aufbau Principle 
B)  Hund's Rule 
C)  Pauli Exclusion Principle 
D)  (
A) and (
B) only 
E)  All three 
A)  Aufbau Principle 
B)  Hund's Rule 
C)  Pauli Exclusion Principle 
D)  (
A) and (
B) only 
E)  All three

Question 10

Select the least electronegative element from the list below:

Accepted Answer

A)  P 
B)  N 
C)  Mg 
D)  Si 
E)  K 
A)  P 
B)  N 
C)  Mg 
D)  Si 
E)  K

Question 11

Which compound contains a nitrogen atom with a formal positive charge?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  More than one of the above 
E)  None of the above 
A)  I 
B)  II 
C)  III 
D)  More than one of the above 
E)  None of the above

Question 12

The following electron configuration represents:

Accepted Answer

A)  The ground state of nitrogen 
B)  The ground state of oxygen 
C)  The sp3 hybridized state of carbon 
D)  The excited state of oxygen 
E)  None of the above correctly identifies the given electron configuration 
A)  The ground state of nitrogen 
B)  The ground state of oxygen 
C)  The sp3 hybridized state of carbon 
D)  The excited state of oxygen 
E)  None of the above correctly identifies the given electron configuration

Question 13

The bond angle for the C-C-H bonds in CH3CN would be expected to be approximately:

Accepted Answer

A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  145 $\degree$ 
E)  180 $\degree$ 
A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  145 $\degree$ 
E)  180 $\degree$

Question 14

The bond angle for the C-N-O bonds in the following molecule would be expected to be approximately:

Accepted Answer

A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  145 $\degree$ 
E)  180 $\degree$ 
A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  145 $\degree$ 
E)  180 $\degree$

Question 15

Which of the following species are resonance forms of the species in the box?

Accepted Answer

A)  I and III 
B)  I and II 
C)  III and IV 
D)  II and IV 
E)  All of the above are correct resonance forms. 
A)  I and III 
B)  I and II 
C)  III and IV 
D)  II and IV 
E)  All of the above are correct resonance forms.

Question 16

Different compounds with the same molecular formula are referred to as __________.

Accepted Answer

The answer of Different compounds with the same molecular formula...

Question 17

What is the hybridization of the O atom in the following molecule?

Accepted Answer

A)  sp3 
B)  sp2 
C)  sp 
D)  s 
E)  p 
A)  sp3 
B)  sp2 
C)  sp 
D)  s 
E)  p

Question 18

Which of the following represent a pair of constitutional isomers?

Accepted Answer

A) 
  
B)  CH3CH=CH2 and CH2=CHCH3 
C) 
  
D) 
  
E)  More than one of these 
A) 
  
B)  CH3CH=CH2 and CH2=CHCH3 
C) 
  
D) 
  
E)  More than one of these

Question 19

Which compound is not a constitutional isomer of the others?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  All of the above are isomers of each other. 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  All of the above are isomers of each other.

Question 20

What is the formal charge on carbon in the following structure?

Accepted Answer

A)  +2 
B)  +1 
C)  0 
D)  -1 
E)  -2 
A)  +2 
B)  +1 
C)  0 
D)  -1 
E)  -2

Exam 1: Carbon Compounds and Chemical Bonds

The C4-C5 carbon-carbon bond in the following molecule results from the overlap of which orbitals ( in the order C4-C5)?

Which of the following species is/are not a resonance form(s)of the species in the box?

Which of the following species is/are not a resonance form(s)of the species in the box?

Which of the structures below would be trigonal planar (a planar triangle)? (Electrical charges have been deliberately omitted. )

In which molecule is the central atom sp3 hybridized?

Based on the VSEPR theory,which of the following would have a tetrahedral arrangement of electrons around the central atom?

What would be the spatial arrangement of the atoms of the ozone molecule (O3)?

What is the geometry of the C indicated with the arrow?

Which principle(s)or rule(s)must be used to determine the correct electronic configuration for carbon in its ground state?

Select the least electronegative element from the list below:

Which compound contains a nitrogen atom with a formal positive charge?

The following electron configuration represents:

The bond angle for the C-C-H bonds in CH3CN would be expected to be approximately:

The bond angle for the C-N-O bonds in the following molecule would be expected to be approximately:

Which of the following species are resonance forms of the species in the box?

Different compounds with the same molecular formula are referred to as __________.

What is the hybridization of the O atom in the following molecule?

Which of the following represent a pair of constitutional isomers?

Which compound is not a constitutional isomer of the others?

What is the formal charge on carbon in the following structure?

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

In which molecule is the central atom sp³ hybridized?

What would be the spatial arrangement of the atoms of the ozone molecule (O₃)?

The bond angle for the C-C-H bonds in CH₃CN would be expected to be approximately: