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Chapter 9

front 1 The basis of the VSEPR model of molecular bonding is __________. A) regions of electron density on an atom will organize themselves so as to maximize s-character B) regions of electron density in the valence shell of an atom will arrange themselves so as to maximize overlap C) atomic orbitals of the bonding atoms must overlap for a bond to form D) electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions E) hybrid orbitals will form as necessary to, as closely as possible, achieve spherical symmetry	back 1 Answer: D
front 2 According to VSEPR theory, if there are three electron domains in the valence shell of an atom, they will be arranged in a(n) __________ geometry. A) octahedral B) linear C) tetrahedral D) trigonal planar E) trigonal bipyramidal	back 2 Answer: D
front 3 In counting the electron domains around the central atom in VSEPR theory, a __________ is not included. A) nonbonding pair of electrons B) single covalent bond C) core level electron pair D) double covalent bond E) triple covalent bond	back 3 Answer: C
front 4 The electron-domain geometry of __________ is tetrahedral. A) CBr4 B) PH3 C) CCl2BR2 D) XeF4 E) all of the above except XeF4	back 4 Answer: E

front 5 The O–C–O bond angle in the CO32- ion is approximately __________. A) 90° B) 109.5° C) 120° D) 180° E) 60°	back 5 Answer: C
front 6 The Cl–C–Cl bond angle in the CCl O2 molecule (C is the central atom) is slightly __________. A) greater than 90° B) less than 109.5° C) less than 120° D) greater than 120° E) greater than 109.5°	back 6 Answer: C
front 7 Of the following species, __________ will have bond angles of 120°. A) PH3 B) ClF3 C) NCl3 D) BCl3 E) All of these will have bond angles of 120°.	back 7 Answer: D
front 8 An electron domain consists of __________. a) a nonbonding pair of electrons b) a single bond c) a multiple bond A) a only B) b only C) c only D) a, b, and c E) b and c	back 8 Answer: D

front 9 According to VSEPR theory, if there are three electron domains on a central atom, they will be arranged such that the angles between the domains are __________. A) 90° B) 180° C) 109.5° D) 360° E) 120°	back 9 Answer: E
front 10 According to VSEPR theory, if there are two electron domains on a central atom, they will be arranged such that the angles between the domains are __________. A) 360° B) 120° C) 109.5° D) 180° E) 90°	back 10 Answer: D
front 11 According to VSEPR theory, if there are four electron domains on a central atom, they will be arranged such that the angles between the domains are __________. A) 120° B) 109.5° C) 180° D) 360° E) 90°	back 11 Answer: B
front 12 The electron-domain geometry and the molecular geometry of a molecule of the general formula ABn are __________. A) never the same B) always the same C) sometimes the same D) not related E) mirror images of one another	back 12 Answer: C

front 13 The electron-domain geometry and the molecular geometry of a molecule of the general formula ABn will always be the same if __________. A) there are no lone pairs on the central atom B) there is more than one central atom C) n is greater than four D) n is less than four E) the octet rule is obeyed	back 13 Answer: A
front 14 For molecules of the general formula ABn , n can be greater than four __________. A) for any element A B) only when A is an element from the third period or below the third period C) only when A is boron or beryllium D) only when A is carbon E) only when A is Xe	back 14 Answer: B
front 15 Consider the following species when answering the following questions: (i) PCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6 For which of the molecules is the molecular geometry (shape) the same as the VSEPR electron domain arrangement (electron domain geometry)? A) (i) and (ii) B) (i) and (iii) C) (ii) and (v) D) (iv) and (v) E) (v) only	back 15 Answer: C
front 16 Of the molecules below, only __________ is polar. A) SbF5 B) AsH3 C) 2I D) SF6 E) CH4	back 16 Answer: B

front 17 The combination of two atomic orbitals results in the formation of __________ molecular orbitals. A) 1 B) 2 C) 3 D) 4 E) 0	back 17 Answer: B
front 18 The 3 2 sp d atomic hybrid orbital set accommodates __________ electron domains. A) 2 B) 3 C) 4 D) 5 E) 6	back 18 Answer: E
front 19 The 2 sp atomic hybrid orbital set accommodates __________ electron domains. A) 2 B) 3 C) 4 D) 5 E) 6	back 19 Answer: B
front 20 When three atomic orbitals are mixed to form hybrid orbitals, how many hybrid orbitals are formed? A) one B) six C) three D) four E) five	back 20 Answer: C

front 21 The blending of one s atomic orbital and two p atomic orbitals produces __________. A) three sp hybrid orbitals B) two 2 sp hybrid orbitals C) three 3 sp hybrid orbitals D) two 3 sp hybrid orbitals E) three 2 sp hybrid orbitals	back 21 Answer: E
front 22 A triatomic molecule cannot be linear if the hybridization of the central atoms is __________. A) sp B) 2 sp C) 3 sp D) 2 sp or 3 sp E) 2 sp d or 3 2 sp d	back 22 Answer: D
front 23 A typical double bond __________. A) is stronger and shorter than a single bond B) consists of one σ bond and one π bond C) imparts rigidity to a molecule D) consists of two shared electron pairs E) All of the above answers are correct.	back 23 Answer: E
front 24 A typical triple bond __________. A) consists of one σ bond and two π bonds B) consists of three shared electrons C) consists of two σ bonds and one π bond D) consists of six shared electron pairs E) is longer than a single bond	back 24 Answer: A

front 25 In a polyatomic molecule, "localized" bonding electrons are associated with __________. A) one particular atom B) two particular atoms C) all of the atoms in the molecule D) all of the π bonds in the molecule E) two or more σ bonds in the molecule	back 25 Answer: B
front 26 In order to exhibit delocalized π bonding, a molecule must have __________. A) at least two π bonds B) at least two resonance structures C) at least three σ bonds D) at least four atoms E) trigonal planar electron domain geometry	back 26 Answer: B
front 27 In a typical multiple bond, the σ bond results from overlap of __________ orbitals and the π bond(s) result from overlap of __________ orbitals. A) hybrid, atomic B) hybrid, hybrid C) atomic, hybrid D) hybrid, hybrid or atomic E) hybrid or atomic, hybrid or atomic	back 27 Answer: A
front 28 The carbon-carbon σ bond in ethylene, CH CH 2 2 , results from the overlap of __________. A) sp hybrid orbitals B) 3 sp hybrid orbitals C) 2 sp hybrid orbitals D) s atomic orbitals E) p atomic orbitals	back 28 Answer: C

front 29 The π bond in ethylene, CH CH 2 2 , results from the overlap of __________. A) 3 sp hybrid orbitals B) s atomic orbitals C) sp hybrid orbitals D) 2 sp hybrid orbitals E) p atomic orbitals	back 29 Answer: E
front 30 In order for rotation to occur about a double bond, __________. A) the σ bond must be broken B) the π bond must be broken C) the bonding must be delocalized D) the bonding must be localized E) the σ and π bonds must both be broken	back 30 Answer: B
front 31 A typical triple bond consists of __________. A) three sigma bonds B) three pi bonds C) one sigma and two pi bonds D) two sigma and one pi bond E) three ionic bonds	back 31 Answer: C
front 32 The N–N bond in HNNH consists of __________. A) one σ bond and one π bond B) one σ bond and two π bonds C) two σ bonds and one π bond D) two σ bonds and two π bonds E) one σ bond and no π bonds	back 32 Answer: A

front 33 The hybridization of the terminal carbons in the H C=C=CH 2 2 molecule is __________. A) sp B) 2 sp C) 3 sp D) 3 sp d E) 3 2 sp d	back 33 Answer: B
front 34 Electrons in __________ bonds remain localized between two atoms. Electrons in __________ bonds can become delocalized between more than two atoms. A) pi, sigma B) sigma, pi C) pi, pi D) sigma, sigma E) ionic, sigma	back 34 Answer: B
front 35 The bond order of any molecule containing equal numbers of bonding and antibonding electrons is __________. A) 0 B) 1 C) 2 D) 3 E) 1/2	back 35 Answer: A
front 36 An antibonding π orbital contains a maximum of __________ electrons. A) 1 B) 2 C) 4 D) 6 E) 8	back 36 Answer: B

front 37 According to MO theory, overlap of two s atomic orbitals produces __________. A) one bonding molecular orbital and one hybrid orbital B) two bonding molecular orbitals C) two bonding molecular orbitals and two antibonding molecular orbitals D) two bonding molecular orbitals and one antibonding molecular orbital E) one bonding molecular orbital and one antibonding molecular orbital	back 37 Answer: E
front 38 Molecular Orbital theory correctly predicts paramagnetism of oxygen gas, O2 . This is because __________. A) the bond order in O2 can be shown to be equal to 2. B) there are more electrons in the bonding orbitals than in the antibonding orbitals. C) the energy of the 2p π MOs is higher than that of the σ2pMO D) there are two unpaired electrons in the MO electron configuration of O2 E) the O–O bond distance is relatively short	back 38 Answer: D
front 39 Molecular Orbital theory correctly predicts diamagnetism of fluorine gas, F2 . This is because __________. A) the bond order in F2 can be shown to be equal to 1. B) there are more electrons in the bonding orbitals than in the antibonding orbitals. C) all electrons in the MO electron configuration of F2 are paired. D) the energy of the 2p π MOs is higher than that of the σ2pMO E) the F–F bond enthalpy is very low	back 39 Answer: C