Organic Chemistry 230 Final Exam| 50 Questions| With Complete Solutions

Which of the following covalent single bonds is the most polar? A. C-H B. C-O C. C-C D. C-N correct answer: B: C-O Which of the following formulas would correspond to a cyclic alkane? A. C5H12 B. C6H14 C. C7H14 D. C8H18 correct answer: C: C7H14 The compound CH3(CH2)4CH3is called: A. hexane B. heptane C. pentane D. butane correct answer: A: hexane Which of the following is nota property of alkanes? A. Less dense than water B. Strong odor C. Flammable D. Insoluble in water correct answer: B: Strong odor The boiling points of alkanes are primarily influenced by ______________ and __________________.A. Dipole-dipole interactions, surface area B. London dispersion forces, surface area C. London dispersion forces, symmetry D. Dipole-dipole interactions, symmetry correct answer: B: LDF and SA Which of the following cycloalkanes has the most strained bond angles? A. Cyclohexane B. Cyclopentane C. Cyclobutane D. Cyclopropane correct answer: D: Cyclopropane What is the reaction of an alkane combining with oxygen and heat called? A. Halogenation B. Combustion C. Hydrogenation D. Reduction correct answer: B: Combustion Which of the following atoms is least likely to form a polar covalent bond with carbon? A. O B. H C. F D. N correct answer: B: H How many hydrogens would you expect for an acyclic alkane with 6 carbons? A. 10 hydrogens B. 12 hydrogens C. 14 hydrogens D. 16 hydrogens correct answer: C: 14 hydrogens Heptane is best represented as: A. CH3(CH2)5CH3 B. CH3(CH2)4CH3 C. CH3(CH2)3CH3 D. CH3(CH2)2CH3 correct answer: A: CH3(CH2)5CH3 Two or more compounds with the same molecular formula but with the atoms connected differently are referred to as A) normal alkanes B) branched alkanes C) isomers D) conformations correct answer: C: isomers Which of the following is a product of incomplete combustion? A. Carbon dioxide B. Water C. Carbon monoxide D. Combustion is always complete correct answer: C: Carbon monoxide Which of the following cycloalkanes has bond angles below the preferred 109.5°? A. Cyclohexane B. Cyclopentane C. Cyclooctane D. Cyclopropane correct answer: D: Cyclopropane Which of the following have cis and trans isomeric forms? A. 2,3-dimethylbutane B. 3-ethylpent-2-ene C. pent-2-yne D. 4-methylhex-2-ene correct answer: D: 4-methylhex-2-ene