Chapter 2

Question 1

An orbital can be described by its ________, which is the mathematical description of the shape of the electron wave as it oscillates.

Answer 1

Answer: wave function

Question 2

The electron density at any point is proportional to the ________ of the electron wave at that point.

Answer 2

Answer: square of the wave function

Question 3

Two p orbitals can overlap to form a s molecular orbital.  How many nodes are present in this s molecular orbital?
A) 0
B) 1
C) 2
D) 3

Answer 3

C) 2

Question 4

Two p orbitals can overlap to form a s* molecular orbital.  How many nodes are present in this s* molecular orbital?
A) 0
B) 1
C) 2
D) 3

Answer 4

D) 3

Question 5

When orbitals on different atoms interact, ________ are produced.

Answer 5

Answer: molecular orbitals

Question 6

Consider the interaction of two hydrogen 1s atomic orbitals of the same phase. Which of the statements below is an incorrect description of this interaction?
A) A sigma bonding molecular orbital is formed.
B) The molecular orbital formed is lower in energy than a hydrogen 1s atomic orbital.
C) The molecular orbital formed has a node between the atoms.
D) The molecular orbital formed is cylindrically symmetric.
E) A maximum of two electrons may occupy the molecular orbital formed.

Answer 6

C) The molecular orbital formed has a node between the atoms.

Question 7

If a compound, C5H7NO, contains 1 ring, how many pi bonds are there in this compound? 
A) 0
B) 1
C) 2
D) 3

Answer 7

C) 2

Question 8

Which of the following statements about π molecular orbitals is/are correct?
A) π molecular orbitals are cylindrically symmetric.
B) Most of the electron density in a π molecular orbital is centered above and below the internuclear axis.
C) When two atoms are connected by a double bond, both of these bonds are π bonds.
D) Both statements B and C are correct.
E) Statements A, B, and C are all correct.

Answer 8

B) Most of the electron density in a π molecular orbital is centered above and below the internuclear axis.

Question 9

Choose the term below which best describes the geometry of acetylene (HCCH).
A) trigonal bipyramidal
B) trigonal
C) tetrahedral
D) square planar
E) linear

Answer 9

E) linear

Question 10

Triethylamine [(CH3CH2)3N] is a molecule in which the nitrogen atom is ________ hybridized and the CNC bond angle is ________.
A) sp2, >109.5°
B) sp2, 109.5°
D) sp3,

Answer 10

D) sp3,

Question 11

Acrylonitrile (CH2=CHCN) contains \_\_\_\_\_\_\_\_ s bonds and \_\_\_\_\_\_\_\_ p bonds.
A) 4, 1
B) 6, 3
C) 4, 3
D) 6, 1
E) 2, 0

Answer 11

B) 6, 3

Question 12

The CCN bond angle in acrylonitrile (CH2=CHCN) is approximately \_\_\_\_\_\_\_\_.
A) 60°
B) 90°
C) 109.5°
D) 120°
E) 180°

Answer 12

E) 180°

Question 13

The HNC bond angle in the cation [CH2NH2]+ is approximately \_\_\_\_\_\_\_\_.
A) 60°
B) 90°
C) 109.5°
D) 120°
E) 180°

Answer 13

D) 120°

Question 14

Boron trifluoride (BF3) is a molecule in which the boron atom is ________ hybridized and the FBF bond angle is ________.

Answer 14

Answer: sp2, 120°

Question 15

A molecule of acetylene (C2H2) has a \_\_\_\_\_\_\_\_ geometry and a molecular dipole moment that is \_\_\_\_\_\_\_\_.
A) tetrahedral, nonzero
B) bent, nonzero
C) bent, zero
D) linear, nonzero
E) linear, zero

Answer 15

E) linear, zero

Question 16

Which of the following statements is correct?
A) Higher molecular dipole values (μ) are associated with nonpolar molecules
B) All polar molecules are capable of hydrogen bond formation
C) The polarity of a molecule is dependent on its three-dimensional structure
D) Induced dipole interactions are usually stronger than dipole-dipole interactions
E) Polar solutes tend to be more soluble in nonpolar solvents

Answer 16

C) The polarity of a molecule is dependent on its three-dimensional structure

Question 17

Which one of the molecules shown below has no net molecular dipole moment?
A) CH3Cl
B) H2CCH2
C) CH2O
D) CH2Cl2
E) CH3OH

Answer 17

B) H2CCH2

Question 18

Which one of the molecules shown below has a net molecular dipole moment?
A) CCl4
B) CO2
C) CH3CCl3
D) BeCl2

Answer 18

C) CH3CCl3

Question 19

What intermolecular forces are present among molecules in dimethyl ether, CH3OCH3?
A) London forces only
B) hydrogen bonding only
C) both London dispersion forces and hydrogen bonding
D) both London dispersion forces and dipole-dipole forces

Answer 19

D) both London dispersion forces and dipole-dipole forces

Question 20

Which of the molecules below can hydrogen bond to another of the same compound?
A) CH3CH2OCH2CH3
B) CH3CH2COOCH3
C) (CH3CH2)2CHOH
D) CH3CH2COCH2CH3
E) all of the above

Answer 20

C) (CH3CH2)2CHOH

Question 21

Which functional groups below indicate the presence of two atoms connected by a triple bond?
A) alkyne
B) alkene
C) nitrile
D) ester
E) both A and C

Answer 21

E) both A and C

Question 22

What name is given to a hydrocarbon that contains a carbon-carbon triple bond?
A) alkane
B) alkene
C) alkyne
D) aromatic
E) none of the above

Answer 22

C) alkyne

Question 23

Choose the functional group which is not represented in the structure of RU-486.
A) alkyne
B) alcohol
C) ketone
D) amine
E) ether

Answer 23

E) ether

Question 24

Which of the molecules below is an ester?
A) CH3CH2CH(CH3)2
B) CH3OCH2CH2CH3
C) CH3COOH
D) CH3COOCH3
E) HC≡CCH3

Answer 24

D) CH3COOCH3

Question 25

Which of the functional groups below contain a hydroxyl group as a part of their structure?
A) aldehyde
B) alcohol
C) carboxylic acid
D) amine
E) B and C only

Answer 25

E) B and C only

Question 26

Which of the class of organic compound below contains a carbonyl group as a part of its structure?
A) aldehyde
B) ketone
C) carboxylic acid
D) ester
E) all of the above

Answer 26

E) all of the above

Question 27

Which of the following does not contain a carbonyl group?
A) aldehyde
B) ketone
C) carboxylic acid
D) ester
E) ether

Answer 27

E) ether

Question 28

Which of the following functional groups does not have at least one sp2 hybridized carbon atom as a constituent of the group?
A) carboxylic acid
B) alkene
C) aldehyde
D) ether
E) ester

Answer 28

D) ether

Question 29

Which molecule below is an ether?
A) CH3CH2OCH2CH3
B) (CH3)2CHCH2OH
C) (CH3)2CHCH2NH2
D) (CH3)2C=CH2
E) CH3CH2CH2CO2H

Answer 29

A) CH3CH2OCH2CH3

Question 30

Which of the molecules below can be properly called an amine?
A) CH3CN
B) CH3COOH
C) CH3CH2CH2OH
D) CH3CH2NHCH3
E) CH3CH2CH2NO2

Answer 30

D) CH3CH2NHCH3