Exam 9: Molecular Geometry: Shape Determines Function

According to the molecular orbital energy-level diagram below, which one of the following statements is not correct about NO, NO⁺, and NO^-? These molecular orbitals are formed from the 2s and 2p atomic orbitals.

Which statement A-D about sigma ( $\sigma$ ) and pi ( $\pi$ ) bonds is not correct?

Use the relative energies of the molecular orbitals given below, which are derived from the n = 5 atomic orbitals, to determine the bond orders in I_{2 ,} $\mathrm { I } _ { 2 } ^ { + }$ , and $\mathrm { I } _ { 2 } ^ { - }$ , and identify the species that is predicted to be the most stable. The valence molecular orbitals in order of increasing energy are

Arrange the interactions between pairs of electrons in order of increasing strength.

Which statement about VSEPR theory is not correct?

Identify the molecular geometry of the nitrate ion, $\mathrm { NO } _ {\bar{ 3 }}$ , and the hybridization of the N atomic orbitals.

Carbonyl dihalides (COX₂ with X = I, Cl, or Br) are irritants and can cause blistering of tissue. Their reactivity with tissue is influenced by their polarity. Place these compounds in order of decreasing polarity and explain your reasoning.

What is the valence electron molecular orbital electron configuration of O₂?

Which of the following has a central atom with the same hybridization as the oxygen in water?

Boron nitride, BN, is a new high-tech material. According to the molecular orbital energy-level diagram below, which one of the following statements is not correct about boron nitride? These molecular orbitals are formed from the 2s and 2p atomic orbitals.

Which electron-pair geometry corresponds to a steric number of 5?

Which bond is the most polar?

What is the molecular geometry of SF₄O?

Which of the following molecules has a bond order that is less than one?

Methyl thiocyanate (CH₃SCN) is used as an agricultural pesticide and fumigant. Use formal charge to identify the most stable Lewis structure for this compound. Based on this structure, predict the local molecular geometry and hybridization at each atom except hydrogen.

Ritalin is used to control attention deficit hyperactivity. Thalidomide was used in the 1950s to treat morning sickness. One enantiomer of thalidomide was found to produce birth defects. How many chiral centers are there together in these two molecules? Note hydrogen atoms attached to carbon are implicit.

Which bond angle is the smallest?

Which statement regarding a pi bond between two carbon atoms is correct?

Predict the bond order of the NO⁺ molecular ion.

What is the hybridization of the central iodine atom in I₃^-?