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Which of the following statements about alkanes is not true?


A) Alkanes are aliphatic hydrocarbons.
B) Alkanes contain only C-C and C-H s bonds.
C) Alkanes are acyclic or cyclic.
D) Acyclic alkanes have two fewer H atoms than cyclic alkanes with the same number of carbons.

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What is the common name of the following alkyl group? What is the common name of the following alkyl group? A) Isobutyl B) sec-Butyl C) Isopropyl D) tert-Butyl


A) Isobutyl
B) sec-Butyl
C) Isopropyl
D) tert-Butyl

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How many cycloalkane constitutional isomers (excluding stereoisomers) are there with molecular formula C5H10?


A) 2
B) 3
C) 4
D) 5

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Which of the following conformers has the highest energy? Which of the following conformers has the highest energy? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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Which of the following is the most stable conformation of cis-1-ethyl-3-isopropylcyclohexane? Which of the following is the most stable conformation of cis-1-ethyl-3-isopropylcyclohexane? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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What is the name of the alkyl group that contains two carbons in a straight chain and one-carbon branch?


A) Ethyl
B) Propyl
C) Isopropyl
D) None of these

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What is the IUPAC name for the following compound? What is the IUPAC name for the following compound? A) Hexylcyclopentane B) 1-Hexylcyclopentane C) 1-Cyclopentylhexane D) 1-Cyclopentylheptane


A) Hexylcyclopentane
B) 1-Hexylcyclopentane
C) 1-Cyclopentylhexane
D) 1-Cyclopentylheptane

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Which of the following cycloalkanes has the most angle strain?


A) Cyclopropane
B) Cyclobutane
C) Cyclopentane
D) Cyclohexane

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Which of the following cycloalkanes has the least angle strain?


A) Cyclopropane
B) Cyclohexane
C) Cyclopentane
D) Cycloheptane

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Which of the following is the most stable conformation of trans-1-isopropyl-3-methylcyclohexane? Which of the following is the most stable conformation of trans-1-isopropyl-3-methylcyclohexane? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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What are the products of the combustion of alkanes?


A) Carbon and hydrogen
B) Carbon and water
C) Carbon dioxide and hydrogen
D) Carbon dioxide and water

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Which of the following is the highest energy conformer of 2,3-dimethylbutane? Which of the following is the highest energy conformer of 2,3-dimethylbutane? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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Which of the following is not another representation for 2-methylbutane? Which of the following is not another representation for 2-methylbutane? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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What is the IUPAC name for the following compound? What is the IUPAC name for the following compound? A) 2,3-Dimethyl-4-sec-butylheptane B) 4-sec-Butyl-2,3-dimethylheptane C) 3,5,6-Trimethyl-4-propylheptane D) 2,3,5-Trimethyl-4-propylheptane


A) 2,3-Dimethyl-4-sec-butylheptane
B) 4-sec-Butyl-2,3-dimethylheptane
C) 3,5,6-Trimethyl-4-propylheptane
D) 2,3,5-Trimethyl-4-propylheptane

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Which of the following is the most stable conformation of the following compound? Which of the following is the most stable conformation of the following compound? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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Rank the conformers of butane in order of decreasing stability,putting the most stable first. Rank the conformers of butane in order of decreasing stability,putting the most stable first. A) IV > I > II > III B) IV > I > III > II C) II > III > I > IV D) I > IV > II > III


A) IV > I > II > III
B) IV > I > III > II
C) II > III > I > IV
D) I > IV > II > III

Correct Answer

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Which of the following statements about the conformations of acyclic alkanes is not true?


A) The staggered and eclipsed conformations are equally stable.
B) The staggered conformations are more stable than the eclipsed conformations.
C) An energy minimum and maximum occur every 60° as the conformation changes from staggered to eclipsed.
D) Conformations that are neither staggered nor eclipsed are intermediate in energy.

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Which of the following statements about the conformations of acyclic alkanes is true?


A) Conformations are the same arrangements of atoms that cannot be interconverted by rotation about single bonds.
B) In the eclipsed conformation,the C-H bonds on one carbon bisect the H-C-H bond angle on the adjacent carbon.
C) In the staggered conformation,the C-H bonds on one carbon are directly aligned with the C-H bonds on the adjacent carbon.
D) Rotating the atoms on one carbon by 60° converts an eclipsed conformation into a staggered conformation,and vice versa.

Correct Answer

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Rank the following alkanes in order of increasing melting point,putting the alkane with the lowest melting point first. Rank the following alkanes in order of increasing melting point,putting the alkane with the lowest melting point first. A) I < III < II B) I < II < III C) II < III < I D) III < II < I


A) I < III < II
B) I < II < III
C) II < III < I
D) III < II < I

Correct Answer

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Which formula represents a cycloalkane with 5 carbons?


A) C5H8
B) C5H10
C) C5H12
D) C5H14

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