Question 1

Which of the following molecular formulas corresponds to a hydrocarbon with three degrees of unsaturation?

Accepted Answer

$$\mathrm{C}_8\mathrm{H}_{12}$$

Question 2

A compound with the molecular formula $$\mathrm{C}_8\mathrm{H}_{14}$$ has how many degrees of unsaturation?

Accepted Answer

2

Question 3

Which of the following is the correct IUPAC name for the compound shown below?

$$\mathrm{CH}_2=CHCH_2CH_3$$

Accepted Answer

1-butene

Question 4

Which statement best describes the difference between saturated and unsaturated hydrocarbons?

Accepted Answer

Saturated hydrocarbons have no double bonds, while unsaturated hydrocarbons have one or more double bonds.

Question 5

What is the correct name for the following alkene stereoisomer?

$$\mathrm{CH}_3CH=CHCH_2CH_3$$ with the two largest groups on opposite sides of the double bond.

Accepted Answer

trans-2-pentene

Question 6

Which of the following compounds is an example of a diene?

Accepted Answer

$$\mathrm{CH}_2=CHCH=CH_2$

Question 7

Which of the following statements about the stability of alkenes is correct?

Accepted Answer

The more alkyl groups bonded to the sp$$^2$$ carbons, the more stable the alkene.

Question 8

Which of the following is a correct condensed structural formula for cyclopentene?

Accepted Answer

A five-membered ring with one double bond

Question 9

Which of the following is true regarding the mechanism of the addition of HBr to 2-butene?

Accepted Answer

The first step involves formation of a carbocation intermediate.

Question 10

Which of the following best describes an electrophile?

Accepted Answer

A species with a positive charge, partial positive charge, or incomplete octet.

Question 11

What is the degree of unsaturation for a compound with the formula $$\mathrm{C}_7\mathrm{H}_{12}$$?

Accepted Answer

2

Question 12

Which of the following is the correct IUPAC name for a compound with two double bonds at positions 1 and 3 in a five-carbon chain?

Accepted Answer

1,3-pentadiene

Question 13

Which of the following statements about the heat of hydrogenation ($$\Delta H^\prime) of $$alkenes is correct?

Accepted Answer

The most stable alkene has the smallest heat of hydrogenation.

Question 14

Which of the following is a nucleophile?

Accepted Answer

$$\mathrm{Br}^-$$

Question 15

Which of the following best describes the role of a catalyst in a chemical reaction?

Accepted Answer

It provides a pathway with a lower energy barrier.

Question 16

Which equation correctly relates the free energy change ($$\Delta G) to $$the equilibrium constant ($$K_{eq}$$)?

Accepted Answer

$$\Delta G = -RT \ln K_{eq}$$

Question 17

Which of the following factors will increase the rate of a chemical reaction?

Accepted Answer

Adding a catalyst

Question 18

Which of the following is the correct rate law for a second-order reaction involving reactants A and B?

Accepted Answer

$$	ext{rate} = k[A][B]$$

Question 19

Which of the following best describes the transition state in a chemical reaction?

Accepted Answer

It is a species with partially formed and partially broken bonds.

Question 20

Which of the following is true about the rate-limiting step in the addition of HBr to 2-butene?

Accepted Answer

It is the step with the highest energy transition state.

Alkenes: Structure, Nomenclature, and Introduction to Reactions, Thermodynamics, and Kinetics

Study Guide - Practice Questions