Chapter 25 Practice Test

Question 1

What is the name of the alkane represented by the zig-zag structure?

Answer 1

butane

Question 2

Which statement related to alkanes is not correct?

Answer 2

An electron density within an alkane molecule does not necessarily affect other neighboring molecules.

Question 3

Which statement about carbon is not correct?

Answer 3

There are only a few elements that are more frequently used in various molecules than the element carbon.

Question 4

Which statement about tetrahedral geometry is not correct?

Answer 4

All of the bonding angles in a tetrahedral geometry are 120°.

Question 5

Which statement about hydrocarbons is not correct?

Answer 5

Alkanes, alkenes, and alkynes all contain at least one pi bond.

Question 6

Which statement about alkene isomers is not correct?

Answer 6

Alkenes are less reactive than alkanes.

Question 7

Which statement does not correctly describe a characteristic of a π bond?

Answer 7

The greatest electron density exists along the internuclear axis.

Question 8

Which statement about alkynes is not correct?

Answer 8

Alkynes have one π and two σ bonds.

Question 9

Look at the two pairs of alkene isomers. Which statement about these isomers is not correct?

Answer 9

1-butene and 2-butene are enantiomers.

Question 10

Figure 2 is a shorthand version of Figure 1. Both figures represent thalidomide. Which statement about these figures is not correct?

Answer 10

Any bonds that are missing can be assumed to be double bonds between C and H.

Question 11

Which statement about the two pentane isomers is not correct?

Answer 11

The two isomers are stereoisomers.

Question 12

Which statement about enantiomers is not correct?

Answer 12

Enantiomers are superimposable.

Question 13

Look at the four aromatic hydrocarbons. Which statement about aromatic hydrocarbons is not correct?

Answer 13

Aromatic hydrocarbons need a minimum of two π bonds in order to have their unique stability.

Question 14

Which statement about aromatic hydrocarbons is not correct?

Answer 14

Aromatic hydrocarbons are less stable than alkenes.

Question 15

Which of the following does not happen when bromine reacts with benzene via the use of a catalyst?

Answer 15

Two bromine atoms are incorporated into the molecule.

Question 16

Which statement about aromatic hydrocarbon nomenclature is not correct?

Answer 16

The largest amount of substituent separation occurs on a meta-aromatic hydrocarbon.

Question 17

Which statement about functional group nomenclature is not correct?

Answer 17

The molecule shown in the drawing is methyl dibutyl ether.

Question 18

Which statement about the effect of hydrogen bonding on the boiling point of a substance is not correct?

Answer 18

The effect of the van der Waals forces in ethanol is significantly greater than for diethyl ether.

Question 19

Look at the two propanol molecules. Which statement about these molecules is not correct?

Answer 19

In alcohol molecules with three or fewer carbons, the location of the OH group must be specified.

Question 20

Which statement about carbonyls and carbonyl function groups is not correct?

Answer 20

Ketones have two carbon atoms attached to the oxygen atom in a carbonyl.

Question 21

Which statement about nomenclature of functional groups is not correct?

Answer 21

This molecule is a ketone known as 4-hexanone.

Question 22

Look at the two oxidation reactions. Which statement about the formation of aldehydes or ketones is not correct?

Answer 22

In both reactions, a π bond is broken as a result of the oxidation event.

Question 23

Which statement about polymers is not correct?

Answer 23

Homopolymers are generally larger than heteropolymers.

Question 24

The drawing shows the synthesis of polyethylene. Structure 1 shows the individual monomers (four total), while Structure 2 shows the polymer polyethylene.

Which statement about this synthesis reaction is not correct?

Answer 24

In polyethylene, a σ bond links each monomer. This σ bond is made by the breaking of a σ bond in the original, separate ethylene molecules.

Question 25

Which statement about the synthesis of a polymer is not correct?

Answer 25

A polymer has an activator molecule on one end and a terminator molecule on the other end. The actual terminator atom is usually a carbon atom.