Question 1

Which property of carbon allows it to form a vast diversity of organic molecules?

Accepted Answer

Its tetravalency, allowing four covalent bonds in various arrangements

Question 2

Which of the following best describes the difference in bonding between alkanes, alkenes, and alkynes?

Accepted Answer

Alkanes have only single bonds, alkenes have at least one double bond, and alkynes have at least one triple bond

Question 3

Which of the following is a correct general formula for alkanes?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n+2}$$

Question 4

Which of the following statements about the reactivity of alkanes, alkenes, and alkynes is correct?

Accepted Answer

Alkenes and alkynes are more reactive than alkanes because of their multiple bonds

Question 5

Which industrial use is correctly matched with its hydrocarbon type?

Accepted Answer

Alkene: Used as a starting material for making polyethylene

Question 6

Which of the following best explains why carbon can form chains and rings in organic molecules?

Accepted Answer

Carbon atoms are small and can form strong covalent bonds with other carbon atoms

Question 7

A hydrocarbon with the formula $$\mathrm{C}_5\mathrm{H}_{10} is $$most likely:

Accepted Answer

An alkene

Question 8

Which of the following is a common industrial use of ethyne (acetylene)?

Accepted Answer

As a fuel in welding torches

Question 9

Which of the following best describes the geometry around each carbon atom in ethene ($$\mathrm{C}_2\mathrm{H}_4$$)?

Accepted Answer

Trigonal planar

Question 10

Which of the following reactions is characteristic of alkenes but not alkanes?

Accepted Answer

Addition of bromine ($$\mathrm{Br}_2) $$across the double bond

Question 11

A hydrocarbon is found to rapidly decolorize bromine water. Which class does it most likely belong to?

Accepted Answer

Alkene

Question 12

Which of the following best explains why alkanes are generally less reactive than alkenes and alkynes?

Accepted Answer

Alkanes have only single bonds, which are stronger and less reactive than double or triple bonds

Question 13

Which of the following is a correct statement about the industrial use of alkanes?

Accepted Answer

Alkanes are commonly used as fuels in heating and transportation

Question 14

Which of the following best describes the hybridization of carbon atoms in ethyne ($$\mathrm{C}_2\mathrm{H}_2$$)?

Accepted Answer

$$\mathrm{sp}$$

Question 15

Which of the following is a correct comparison of the boiling points of alkanes, alkenes, and alkynes with similar molecular weights?

Accepted Answer

Alkynes generally have higher boiling points than alkanes and alkenes

Question 16

Which of the following is a correct statement about the industrial use of ethene (ethylene)?

Accepted Answer

It is used as a ripening agent for fruits

Question 17

Which of the following best explains why alkynes are more reactive than alkanes?

Accepted Answer

Alkynes have a triple bond, which is more reactive due to higher electron density

Question 18

Which of the following is a correct general formula for alkynes?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n-2}$$

Question 19

Which of the following best describes the geometry around each carbon atom in ethyne ($$\mathrm{C}_2\mathrm{H}_2$$)?

Accepted Answer

Linear

Question 20

Which of the following is a correct statement about the industrial use of alkynes?

Accepted Answer

Alkynes are used as starting materials for making plastics such as PVC

Introduction to Organic Chemistry: Alkanes, Alkenes, and Alkynes

Study Guide - Practice Questions