Alkenes & Alkanes

Question 1

What is the general formula for alkanes?

Answer 1

C_nH_(2n+2)

Question 2

True or False: Alkenes contain at least one carbon-carbon double bond.

Answer 2

True

Question 3

Fill in the blank: The general formula for alkenes is C_nH_n_.

Answer 3

2n

Question 4

What type of reaction do alkenes typically undergo?

Answer 4

Addition reactions

Question 5

Which of the following is an example of an alkene: Ethane, Ethylene, Propane?

Answer 5

Ethylene

Question 6

What is a key characteristic of alkanes?

Answer 6

They are saturated hydrocarbons.

Question 7

What is the primary source of alkanes?

Answer 7

Fossil fuels

Question 8

True or False: Alkenes are more reactive than alkanes.

Answer 8

True

Question 9

What is the simplest alkene?

Answer 9

Ethene (C2H4)

Question 10

Identify the type of isomerism present in alkenes.

Answer 10

Geometric (cis-trans) isomerism

Question 11

What reaction occurs when alkenes react with hydrogen?

Answer 11

Hydrogenation

Question 12

True or False: Alkanes can participate in addition reactions.

Answer 12

False

Question 13

What is the main product of the combustion of alkanes?

Answer 13

Carbon dioxide and water

Question 14

Fill in the blank: Alkenes can be converted to alcohols through a process called ___.

Answer 14

Hydration

Question 15

Which alkane has the molecular formula C4H10?

Answer 15

Butane

Question 16

What is the term for a hydrocarbon with only single bonds?

Answer 16

Saturated hydrocarbon

Question 17

What type of bond is present in alkenes?

Answer 17

Double bond

Question 18

What is the boiling point trend for alkanes as the number of carbon atoms increases?

Answer 18

The boiling point increases.

Question 19

Which process is used to convert alkenes into polymers?

Answer 19

Polymerization

Question 20

What is the name of the reaction where alkenes react with halogens?

Answer 20

Halogenation

Question 21

Explain, in terms of sigma and pi bonds, why alkenes are more reactive than alkanes.

Answer 21

Alkanes only have sigma bonds which are very strong and unreactive, alkenes have sigma and pi bonds but pi bonds are weak & reactive - they are targeted in reactions as they break easily.