Chapter 2

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

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

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

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

When orbitals on different atoms interact, ________ are produced.

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.

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

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.

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

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,

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

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

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

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

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

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

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

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

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

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

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

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

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

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