Test Bank for Essential Organic Chemistry Plus Mastering Chemistry , 3rd Edition

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1Essential Organic Chemistry, 3e(Bruice)Chapter 1Remembering General Chemistry: Electronic Structure and Bonding1) What element is represented by the following electronic configuration?1s2 2s2 2p5A) FB) CC) ND) AlE) OAnswer: ADiff: 2Section: 1-2Objective: G2, G3LO: 1.22) How many unpaired electrons are present in the electronic configuation of carbon (atomicnumber = 6)?A) noneB) oneC) twoD) threeE) fourAnswer: CDiff: 2Section: 1-2Objective: G2, G3LO: 1.23) Which of the following is the electronic configuration of the element Fe?A) 1s2 2s2 2p6 3s2 3p6 4s2 3d6B) 1s2 2s2 2p6 3s2 3p8 3d6C) 1s2 2s2 2p8 3s2 3p6 4s2 3d6D) 1s2 2s2 2p6 3s2 3p6 4s2 4d6E) 1s2 2s2 2p6 3s2 3p6 4s2 4p6Answer: ADiff: 2Section: 1-2Objective: G2, G3LO: 1.2

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24) The atomic number of boron is 5. The correct electronic configuration of boron is ________.A) 1s2 2s3B) 1s2 2p3C) 1s2 2s2 2p1D) 2s2 2p3E) 1s2 2s2 3s1Answer: CDiff: 2Section: 1-2Objective: G2, G3LO: 1.25) Which of the following statements correctly describes the third shell that surrounds thenucleus of an atom?A) The third shell contains onlysandpatomic orbitals.B) The maximum number of electrons that can occupy the third shell is 18.C) The total number of atomic orbitals present in the third shell is 16.D) The third shell can containforbitals.E) All third shell elements must havedelectrons.Answer: BDiff: 2Section: 1-2Objective: G2, G3LO: 1.26) What is the electronic configuration of N3-?A) 1s2 2s2B) 1s2 2s2 2p3C) 1s2 2s2 2p4D) 1s2 2s2 2p6E) 1s2 2s2 2p6 3s1Answer: DDiff: 2Section: 1-2Objective: G2, G3LO: 1.2

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37) Which of the following atoms is the least electronegative?A) PB) NaC) ID) BE) OAnswer: BDiff: 2Section: 1-3Objective: G2, G3LO: 1.48) Which of the following compounds have bonds that are predominantly ionic?A) KClB) CF4C) NH3D) both A and BE) both B and CAnswer: ADiff: 2Section: 1-3Objective: G2, G3LO: 1.39) What type of bonding is found in CH3CH2CH2CH2CH2CH3?A) ionicB) hydrogenC) covalentD) polarAnswer: CDiff: 2Section: 1-3Objective: G2, G3LO: 1.310) Which of the following contains polar covalent bonds?A) NH3B) Na2OC) H2D) KFE) both A and CAnswer: ADiff: 2Section: 1-3Objective: G2, G3LO: 1.3

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411) Which of the following covalent bonds has the largest dipole moment?A) C-CB) C-HC) C-OD) H-NE) H-FAnswer: EDiff: 2Section: 1-3Objective: G2, G3LO: 1.312) How many nonbonding pairs of electrons are in H2NOH?A) 0B) 1C) 2D) 3E) 4Answer: DDiff: 3Section: 1-4Objective: G2, G3LO: 1.413) The compound CH3NH2, contains a C-N bond. Which of the following best describes thecharge on the nitrogen atom in this compound?A) +1B) slightly positiveC) unchargedD) slightly negativeE) -1Answer: DDiff: 2Section: 1-4Objective: G2, G3LO: 1.4

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514) The formal charge on nitrogen in the following compound is ________.A) +2B) +1C) 0D) -1E) -2Answer: BDiff: 2Section: 1-4Objective: G2, G3LO: 1.515) Which of the following is the most likely Lewis structure for C2H2?A)B)C)D)H—CC—HE)Answer: DDiff: 2Section: 1-4Objective: G2, G3LO: 1.5

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616) Which of the following Lewis structures is correct for CH2N2?A):CH2—NN:B)C)D)E)Answer: DDiff: 2Section: 1-4Objective: G2, G3LO: 1.517) What are the formal charges on nitrogen and on the starred oxygen in the following species?A) N = -1, O = 0B) N = +1, O = -1C) N = +1, O = +1D) N = -1, O = -1E) N= +1, O = 0Answer: EDiff: 2Section: 1-4Objective: G2, G3LO: 1.5

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718) What is the formal charge on the nitrogen in the ammonium ion?A) -2B) -1C) 0D) +1E) +2Answer: DDiff: 2Section: 1-4Objective: G2, G3LO: 1.519) How many degenerateporbitals are in the second shell?A) 0B) 1C) 2D) 3E) 4Answer: DDiff: 2Section: 1-5Objective: G2, G3LO: 1.720) What is the hybridization of the indicated atom ?CH3CH2CH2CH3↑A)spB)sp2C)sp3D) none of the aboveAnswer: CDiff: 2Section: 1-7Objective: G2, G3LO: 1.9

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821) How manysp2 carbons are present in H2C=C=CH2?A) 0B) 1C) 1.5D) 2E) 3Answer: DDiff: 2Section: 1-8Objective: G2, G3LO: 1.10a22) What orbitals overlap to form the C-H bond in ethene (H2C=CH2)?A)s-spB)s-sp2C)s-sp3D)s-pE)p-pAnswer: BDiff: 2Section: 1-8Objective: G2, G3LO: 1.10a23) Are all the carbons in this structure in the same plane?A) YesB) NoAnswer: ADiff: 2Section: 1-8Objective: G2, G3LO: 1.10a

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924) Are all the carbons in this structure in the same plane?A) YesB) NoAnswer: BDiff: 2Section: 1-8Objective: G2, G3LO: 1.10a25) How manysp2-hybridized atoms are in the following compound?A) TwoB) ThreeC) FourD) FiveE) SixAnswer: CDiff: 2Section: 1-8Objective: G2, G3LO: 1.10a

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1026) How many carbon-carbon sigma bonds are in the following compound?A) 1B) 2C) 3D) 4Answer: BDiff: 3Section: 1-9Objective: G2, G3LO: 1.1127) CH3CN contains ________ sigma bonds and ________ pi bonds.A) 5; 2B) 4; 3C) 4; 2D) 2; 2E) 4; 0Answer: ADiff: 2Section: 1-9Objective: G2, G3LO: 1.1128) Which carbons in the following compound aresphybridized?A) carbon 1B) carbon 2C) carbons 1, 3D) carbons 4E) carbons 4, 5Answer: EDiff: 2Section: 1-9Objective: G2, G3LO: 1.11

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1129) How many carbon-carbon sigma bonds are in the following compound?A) 0B) 1C) 2D) 3E) 4Answer: CDiff: 3Section: 1-9Objective: G2, G3LO: 1.1130) How manyspcarbons are in the following compound?A) ZeroB) OneC) TwoD) ThreeAnswer: CDiff: 2Section: 1-9Objective: G2, G3LO: 1.1131) How manysp-hybridized atoms are in the following compound?A) OneB) TwoC) ThreeD) FourAnswer: BDiff: 2Section: 1-9Objective: G2, G3LO: 1.11

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1232) Which of the following has ansp2 carbon?A)B) ∙ CH3C)D) A and BE) A, B and CAnswer: DDiff: 2Section: 1-10Objective: G2, G3LO: 1.1233) What is the bond angle and hybridization of the carbon in +CH3?A) 120°,sp2B) 120°,sp3C) 109.5°,sp2D) 120°,sp2E) 109.5°,sp2Answer: ADiff: 2Section: 1-10Objective: G2, G3LO: 1.1234) What orbitals overlap to form the H-C bond in CH3+?A)sp3-sp3B)sp2-sp3C)s-pD)s-sp2E)s-sp3Answer: DDiff: 2Section: 1-10Objective: G2, G3LO: 1.12

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1335) The lone-pair electrons of the methyl anion occupy a(n) ________ orbital.A)sB)pC)spD)sp2E)sp3Answer: EDiff: 2Section: 1-10Objective: G2, G3LO: 1.1236) The N-H bond in CH3NH2 is a ________ bond formed by the overlap of a(n) ________orbital of N with the ________ orbital of H.A) σ;sp2;sB) σ;sp3;sC) π;sp3;sD) π;sp2;pE) π;p;pAnswer: BDiff: 2Section: 1-11Objective: G2, G3LO: 1.1337) The nitrogen atom in (CH3CH2)3N is ________ hybridized and the C-N-C bond angle is________.A)sp2; >109.5°B)sp2; <109.5°C)sp3; >109.5°D)sp3; <109.5°E)sp; 109.5°Answer: DDiff: 2Section: 1-11Objective: G2, G3LO: 1.13

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1438) The N-H bond in the ammonium ion, +NH4, is formed by the overlap of what two orbitals?A)sp3-sp3B)sp3-sp2C)sp2-sp2D)sp2-sE)sp3-sAnswer: EDiff: 2Section: 1-11Objective: G2, G3LO: 1.1339) Which of the following angles is closest to the C-O-C bond angle in CH3-O-CH3?A) 180°B) 120°C) 109.5°D) 90°E) 160°Answer: CDiff: 2Section: 1-12Objective: G2, G3LO: 1.1440) Each lone pair on the O in CH3OH occupies a(n) ________ orbital.A)sB)pC)spD)sp2E)sp3Answer: EDiff: 2Section: 1-12Objective: G2, G3LO: 1.14

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1541) Of the hydrogen halides, the strongest bond is found in ________ and the longest bond isfound in ________.A) HF; HFB) HF; HIC) HI; HFD) HI; HIE) HCl; HBrAnswer: BDiff: 2Section: 1-13Objective: G2, G3LO: 1.1542) The hydrogen—halogen bond becomes ________ and ________ as the size of the halogenincreases.A) longer; weakerB) longer; strongerC) shorter; weakerD) shorter; strongerAnswer: ADiff: 3Section: 1-13Objective: G2, G3LO: 1.1543) Which bond in the following compound is the shortest?A) bond 1B) bond 2C) bond 3D) bond 4E) bond 5Answer: EDiff: 2Section: 1-14Objective: G2, G3LO: 1.16

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