Deck 3: Alkanes

Question 1

Which of the following represents the oxidation of an organic compound?

A) Adding nitrogen to the molecule
B) Adding chlorine to the molecule
C) Adding oxygen to the molecule
D) All of these are correct.

Answer 1

All of these are correct.

Question 2

What is the IUPAC name for the following compound?

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

Answer 2

2,3,5-Trimethyl-4-propylheptane

Question 3

Which formula represents a cycloalkane with 5 carbons?

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

Answer 3

Cyclopentane

Question 4

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

A) Gauche conformations are generally higher in energy thananti conformations.
B) Staggered conformations are at energy maxima and eclipsed conformations are energy minima.
C) A staggered conformation with two larger groups 180° from each other is calledgauche.
D) A staggered conformation with two larger groups 60° from each other is calledanti.

Question 5

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

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

Question 6

What is the IUPAC name for the following compound?

A) 1-Cyclohexylbutane
B) Butylcyclohexane
C) 1-Butylcyclohexane
D) Cyclohexanebutane

Question 7

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 staggered conformation, the C-H bonds on one carbon are directly aligned with the C-H bonds on the adjacent carbon.
C) Rotating the atoms on one carbon by 60° converts an eclipsed conformation into a staggered conformation, and vice versa.
D) In the eclipsed conformation, the C-H bonds on one carbon bisect the H-C-H bond angle on the adjacent carbon.

Question 8

Which of the following conformers of butane has the highest energy?

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

Question 9

What is the relation between the following pair of compounds?

A) Identical molecules
B) Not isomers of each other
C) Stereoisomers
D) Constitutional isomers

Question 10

Which formula represents a cycloalkane with 6 carbons?

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

Question 11

What is the IUPAC name for the following alkane?

A) 2,3,4,7-tetramethyloctane
B) 2,3,4,7-tetramethylheptane
C) 2,5,6,7-tetramethylheptane
D) 2,5,6,7-tetramethyloctane