Deck 1: Carbon Compounds and Chemical Bonds

Question 1

In which of the following does the central atom have 2 pairs of non-bonding electrons?

A) O₃
B) CO₂
C) CO₃ ^2-
D) NH₄ ⁺
E) H₂S

Answer 1

H₂S

Question 2

Which compound is not a constitutional isomer of the others?

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

Answer 2

I

Question 3

Select the least electronegative element from the list below:

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

Answer 3

K

Question 4

Select the most electronegative element from the list below:

A) H
B) O
C) N
D) B
E) C

Question 5

How many sigma 1s-2sp³ bonds are there in ethane?

A) 7
B) 6
C) 5
D) 3
E) 1

Question 6

Which of the following structures represent compounds that are constitutional isomers of each other?

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

Question 7

Which of the following represent pairs of constitutional isomers?

A)

B)

C)

D) None of these pairs
E) All of these pairs

Question 8

Credit for the first synthesis of an organic compound from an inorganic precursor is usually given to:

A) Berzelius
B) Arrhenius
C) Kekule
D) Wohler
E) Lewis

Question 9

Which of the following is the Lewis structure for CH₃CO₂H?

A)

B)

C)

D)

E)

Question 10

Consider the following: CH₃CH₂CH=CHCH₂CH₃
CH₃CH₂CH₂CH₂CH=CH₂
I
II
CH₃CH=CHCH₂CH₂CH₃
CH₂=CHCH₂CH₂CH₂CH₃
III
IV
Which two structures represent the same compound?

A) I and II
B) II and III
C) I and III
D) II and IV
E) None of these

Question 11

Which of the following is a set of constitutional isomers?

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

Question 12

Which compound is not a constitutional isomer of the others?

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

Question 13

CH₃CH₂OCH₂CH₃ and CH₃CH₂CH₂CH₂OH are examples of what are now termed:

A) Structural isomers
B) Resonance structures
C) Functional isomers
D) Empirical isomers
E) Constitutional isomers

Question 14

Which of the following is the Lewis structure for CH₃CH₂O₂H?

A)

B)

C)

D)

E)

Question 15

Considering Lewis structures,which of these compounds possesses a single unpaired electron?

A) N₂
B) N₂O
C) NO
D) N₂O₄
E) O₂

Question 16

Which of these is a correct electron-dot representation of the nitrite ion,NO₂^-?

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

Question 17

Which is NOT a correct Lewis structure?

A)

B)

C)

D)

E) None of these

Question 18

The greatest degree of ionic character is anticipated for the bond between:

A) H and C
B) H and Cl
C) C and Cl
D) H and Br
E) Br and Cl

Question 19

Which compound is not a constitutional isomer of the others?

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

Question 20

Which of the following represent a pair of constitutional isomers?

A)

B) CH₃CH=CH₂ and CH₂=CHCH₃
C)

D)

E) More than one of these

Question 21

Which of the following species is/are a resonance form(s)of the species in the box?

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

Question 22

In which structure(s)below does the oxygen have a formal charge of +1? s

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

Question 23

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

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

Question 24

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

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

Question 25

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

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

Question 26

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

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

Question 27

Expansion of the valence shell to accommodate more than eight electrons is possible with:

A) Fluorine
B) Nitrogen
C) Carbon
D) Sulfur
E) Beryllium

Question 28

In which structure(s)below does nitrogen have a formal charge of +1?

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

Question 29

Which of the following molecules or ions has a nitrogen with a formal charge of -1? (Charges on ions have been omitted. )

A)

B)

C)

D)

E)

Question 30

Listed below are electron dot formulas for several simple molecules and ions.All valence electrons are shown;however,electrical charges have been omitted deliberately. Which of the structures actually bear(s)a positive charge?

A) I
B) II
C) III
D) III & V
E) IV & V

Question 31

The formal charge on sulfur in sulfuric acid is:

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

Question 32

Listed below are electron dot formulas for several simple molecules and ions.All valence electrons are shown;however,electrical charges have been omitted deliberately. Which of the structures is negatively charged?

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

Question 33

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

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

Question 34

Which of the following is an ion with a single negative charge?

A)

B)

C)

D) All of these
E) None of these

Question 35

Which of the following pairs are NOT resonance structures?

A)

B)

C)

D) Each of these pairs represents resonance structures.
E) None of these pairs represents resonance structures.

Question 36

Which of the following species is a resonance form of the species in the box?

A) I
B) II
C) III
D) IV
E) None of the above are correct resonance forms.

Question 37

In which of these cases does the central atom have a zero formal charge?

A) HFH
B)

C)

D)

E)

Question 38

Which structure(s)contain(s)an oxygen that bears a formal charge of +1?

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

Question 39

Which of the following species is not a resonance form of the following species?

A)

B)

C)

D)

E)

Question 40

Which of the following species is/are a resonance form(s)of the species in the box?

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

Question 41

Which of the structures below is not expected to contribute to the CO₂ resonance hybrid?

A)

B)

C)

D)

E)

Question 42

Which of the following structures is/are not a resonance form of the following species?

A)

B)

C)

D)

E) None of the above are correct resonance forms.

Question 43

How many resonance structures can be written for the NO₃^- ion in which the nitrogen atom bears a formal charge of +1?

A) 1
B) 2
C) 3
D) 4
E) 5

Question 44

Which of the following species is a resonance form of the following species?

A)

B)

C)

D)

E) All the above are correct resonance forms.

Question 45

When the ls orbitals of two hydrogen atoms combine to form a hydrogen molecule,which molecular orbitals are formed?

A) One bonding molecular orbital only
B) Two bonding molecular orbitals
C) One bonding molecular orbital and one antibonding molecular orbital
D) Two antibonding molecular orbitals
E) Three bonding molecular orbitals

Question 46

In quantum mechanics a node (nodal surface or plane)is:

A) a place where $\Psi$ is negative.
B) a place where $\Psi$ is positive.
C) a place where $\Psi$ = 0.
D) a place where $\Psi$ ² is large.
E) a place where $\Psi$ ² is negative.

Question 47

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

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

Question 48

Which of the following could not be a resonance structure of CH₃NO₂?

A)

B)

C)

D)

E) Both C and D

Question 49

Which of the following species exhibits resonance stabilization?

A) H₂SO₄
B) O₃
C) CO₂
D) CCl₄
E) None of the species above exhibit resonance.

Question 50

Which of the following species contributes more to the overall hybrid for the species in the box?

A) I
B) II
C) III
D) IV
E) The one in the box.

Question 51

Which of the following species contributes more to the overall hybrid for the species in the box?

A) I
B) II
C) III
D) IV
E) The one in the box.

Question 52

Which of the following species contributes more to the overall hybrid for the species in the box?

A) I
B) II
C) III
D) IV
E) The one in the box.

Question 53

When the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule,how many molecular orbitals are formed?

A) 1
B) 2
C) 3
D) 4
E) 5

Question 54

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

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

Question 55

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

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 56

Which of the following species contributes more to the overall hybrid for the species in the box?

A) I
B) II
C) III
D) IV
E) The one in the box.

Question 57

Which of the following species contributes more to the overall hybrid for the species in the box?

A) I
B) II
C) III
D) IV
E) The one in the box.

Question 58

Which of the following species contributes more to the overall hybrid for the species in the box?

A) I
B) II
C) III
D) IV
E) The one in the box.

Question 59

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

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

Question 60

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

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

Question 61

Which of the following contains an sp²-hybridized carbon?

A) CH₄
B) CH₃: ^-
C) CH₃CH₃
D) CH₃⁺
E) HC $\equiv$ CH

Question 62

Select the hybridized atomic orbital.

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

Question 63

Identify the atomic orbitals in the C-C sigma bond in ethyne.

A) (2sp²,2sp²)
B) (2sp³,2sp³)
C) (2sp,2sp)
D) (2p,2p)
E) (2sp,1s)

Question 64

Which molecule has the shortest carbon-carbon single bond?

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

Question 65

How many s-sp³ bonds are there in the following substance?

A) 3
B) 8
C) 12
D) 13
E) 16

Question 66

What point on the potential energy diagram below represents the most stable state for the hydrogen molecule?

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

Question 67

cis-trans : isomerism is possible only in the case of:

A) CH₂=CBr₂
B) CH₂=CHBr
C) BrCH=CHBr
D) Br₂C=CHBr
E) Br₂C=CBr₂

Question 68

According to molecular orbital theory,which molecule could not exist?

A) H₂
B) He₂
C) Li₂
D) F₂
E) N₂

Question 69

When the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule,how are the electrons distributed in the resulting molecular orbitals?

A) 2 electrons in the bonding molecular orbital
B) 1 electron in the bonding molecular orbital,1 electron in the non-bonding molecular orbital
C) 1 electron in the bonding molecular orbital,1 electron in the antibonding molecular orbital
D) 2 electrons in the non-bonding molecular orbital
E) 2 electrons in the antibonding molecular orbital

Question 70

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

A) sp³
B) sp²
C) sp
D) s
E) p

Question 71

How many 2p atomic orbitals from boron must be mixed with a 2s atomic orbital to yield the bonding hybrid atomic orbitals in BF₃?

A) 1
B) 2
C) 3
D) 4
E) 5

Question 72

Which compound has the shortest carbon-carbon bond(s)?

A) CH₃CH₃
B) CH₂=CH₂
C) HC $\equiv$ CH
D) CH₃CH₂CH₃
E) All carbon-carbon bonds are the same length.

Question 73

Which is the shortest of the carbon-carbon single bonds indicated by arrows in the following compounds?

A)

B)

C)

D)

E)

Question 74

Which of the following species contributes more to the overall hybrid for the species in the box?

A) I
B) II
C) III
D) IV
E) The one in the box.

Question 75

Identify the atomic orbital.The lone pair electrons on the B atom are contained in:

A) 2sp²
B) 2sp³
C) 2p
D) 2s
E) There are no lone pair electrons on B

Question 76

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

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

Question 77

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

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

Question 78

According to molecular orbital theory,in the case of a carbon-carbon double bond,the carbon-carbon bonding electrons of higher energy occupy this molecular orbital:

A) " $\sigma$ bonding MO"
B) " $\pi$ bonding MO"
C) " $\sigma$ ^* antibonding MO"
D) " $\pi$ ^* antibonding MO"
E) " $\pi$ ^* bonding MO"

Question 79

Consider the following:
Which structures can exist as cis-trans : isomers?

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

Question 80

Identify the atomic orbitals in the C-H sigma bond in acetylene.

A) (2sp²,1s)
B) (2sp³,2sp³)
C) (2sp,2sp)
D) (2p,2p)
E) (2sp,1s)