Exploring Alkanes and Alkenes

What are the general formulas for alkanes and alkenes?

• Alkanes: CnH2n+2; Alkenes: CnH2n

• Alkanes: CnH2n; Alkenes: CnH2n+2

• Alkanes: CnH2n+1; Alkenes: CnH2n-2

• Alkanes: CnH2n+3; Alkenes: CnH2n+1

How do alkenes differ from alkanes?

• Alkenes are unsaturated, while alkanes are saturated.

• Alkenes are saturated, while alkanes are unsaturated.

• Alkenes contain only single bonds, while alkanes contain double bonds.

• Both alkenes and alkanes are unsaturated.

What is the main type of reaction that alkenes undergo?

• Elimination reactions

• Addition reactions

• Substitution reactions

Describe the combustion reaction of alkanes.

• Alkanes only produce carbon monoxide and soot when combusted.

• Alkanes do not release energy during combustion reactions.

• Alkanes combust in the presence of oxygen to produce carbon dioxide and water, releasing energy.

• Alkanes combust in the absence of oxygen to produce nitrogen and hydrogen.

What is a characteristic reaction of alkenes?

• Combustion

• Neutralisation

• substitution reactions

• addition reaction

Explain why alkanes are generally less reactive than alkenes.

• Alkenes are saturated hydrocarbons, while alkanes are not.

• Alkanes are generally less reactive than alkenes due to the absence of double bonds.

• Alkenes have single bonds, making them more stable.

• Alkanes contain more carbon atoms than alkenes.

What is the state of most alkanes at room temperature?

• Gases, liquids, or solids depending on the number of carbon atoms.

• Only liquids

• Only gases

• Only solids

How does the boiling point of alkanes change with increasing molecular size?

• The boiling point of alkanes fluctuates randomly

• The boiling point of alkanes decreases

• The boiling point of alkanes increases

• The boiling point of alkanes remains constant

What type of bond is present in alkenes that is not in alkanes?

• Hydrogen bond (H-H)

• Carbon-carbon double bond (C=C)

• Carbon-carbon single bond (C-C)

• Carbon-carbon triple bond (C≡C)

Name a common use of alkenes in industry.

• Fuel production

• Food preservation

• Textile manufacturing

• Production of plastics