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MULTIPLE CHOICE QUESTIONS
Topic: Atomic Orbitals, Molecular Orbitals
- When the 1 s 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 Topic: Atomic Orbitals
- Which principle(s) or rule 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 Topic: Atomic Orbitals, Bonding
- 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
Topic: Atomic Orbitals, Molecular Orbitals
- According to molecular orbital theory, which molecule could not exist? A) H 2 B) He 2 C) Li 2 D) F 2 E) N 2 Topic: Atomic Orbitals, Molecular Orbitals
- 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 Topic: Atomic Orbitals, Hybridization
- The following electron configuration represents _______. A) the ground state of boron. B) the sp^3 hybridized state of carbon. C) the sp^3 hybridized state of nitrogen. D) the ground state of carbon. E) an excited state of carbon.
Topic: Lewis Structures, Formal Charges
- What is the formal charge on oxygen in the following structure? A) + B) + C) 0 D) - E) - Topic: Lewis Structures, Formal Charges
- 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
Topic: Lewis Structures, Formal Charges
- 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 Topic: Lewis Structures, Formal Charges
- 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)
Topic: Lewis Structures, Formal Charges
- Which of these is a correct electron-dot representation of the nitrite ion, NO 2 -? A) I B) II C) III D) IV E) V Topic: Lewis Structures, Formal Charges
- Which is NOT a correct Lewis structure? A) B) C) D) E) None of these
Topic: Lewis Structures, Formal Charges
- 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 Topic: Lewis Structures, Formal Charges
- 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
Topic: Lewis Structures, Molecular Geometry
- Based on VSEPR theory, which of the following would have a trigonal planar shape? A) CH 3 ) 3 N B) HCN C) NH 4 + D) CH 3 E) CH 3 + Topic: Lewis Structures, Molecular Geometry
- VSEPR theory predicts an identical shape for all of the following, except: A) NH 3 B) H 3 O+ C) BH 3 D) CH 3 - E) All have the same geometry Topic: Lewis Structures, Molecular Geometry
- What shape does the methyl cation, CH 3 +, have? A) Octahedral B) Tetrahedral C) Trigonal planar D) Linear E) Trigonal pyramidal
Topic: Lewis Structures, Molecular Geometry
- Which of the structures below would be trigonal planar (a planar triangle)? (Electrical charges have been deliberately omitted.) A) I B) II C) III D) IV E) I and IV Topic: Lewis Structures, Molecular Geometry
- Which of the following would have a trigonal planar (or triangular) structure? A) I, II, and IV B) II and IV C) IV D) II, IV, and V E) All of these Topic: Molecular Geometry
- What bond angle is associated with a tetrahedral molecule? A) 120 B) 109.5 C) 180 D) 90 E) 45
Topic: Atomic Orbitals, Hybridization
- Select the hybridized atomic orbital. A) I B) II C) III D) IV E) V Topic: Atomic Orbitals, Hybridization
- In which molecule is the central atom sp^3 hybridized? A) CH 4 B) NH 3 C) H 2 O D) All of these E) None of these Topic: Atomic Orbitals, Hybridization
- In which of the following would you expect the central atom to be sp^3 hybridized (or approximately sp^3 hybridized)? A) BH 4 - B) NH 4 + C) CCl 4 D) CH 3 :- E) All of these
Topic: Atomic orbitals, hybridization
- Which compound has the shortest carbon-carbon bond(s)? A) CH 3 CH 3 B) CH 2 =CH 2 C) HCCH D) CH 3 CH 2 CH 3 E) All carbon-carbon bonds are the same length. Topic: Atomic Orbitals, Hybridization
- Which of the following contains an sp^2 -hybridized carbon? A) CH 4 B) CH 3 : C) CH 3 CH 3 D) CH 3 + E) HCCH Topic: Atomic Orbitals, Hybridization
- Which is the shortest of the carbon-carbon single bonds indicated by arrows in the following compounds? A) B) C) D) E)
Topic: Atomic Orbitals, Lewis structures, Resonance
- Which of the structures below is not expected to contribute to the CO 2 resonance hybrid? A) B) C) D) E) Topic: Atomic orbitals, Lewis structures, resonance
- Which of the following could not be a resonance structure of CH 3 NO 2? A) B) C) D) E) Both C and D
Topic: Atomic Orbitals, Lewis Structures, Resonance
- 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. Topic: Atomic Orbitals, Lewis Structures, Resonance
- How many resonance structures can be written for the NO 3 -^ ion in which the nitrogen atom bears a formal charge of +1? A) 1 B) 2 C) 3 D) 4 E) 5 Topic: Isomerism
- 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
Topic: Isomerism
- 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 Topic: Isomerism
- Which compound is not an isomer of the others? A) I B) II C) III D) IV E) All of the above are isomers of each other.
Topic: Isomerism
- Consider the following: CH 3 CH 2 CH=CHCH 2 CH 3 CH 3 CH 2 CH 2 CH 2 CH=CH 2 I II CH 3 CH=CHCH 2 CH 2 CH 3 CH 2 =CHCH 2 CH 2 CH 2 CH 3 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 Topic: Isomerism
- Which of the following represent a pair of constitutional isomers? A) B) CH 3 CH=CH 2 and CH 2 =CHCH 3 C) D) E) More than one of these
