Hydrocarbon Knowledge

What is the general formula for alkanes?

• CnH2n+2

• CnH2n-2

• CnH2n

• CnH2n+3

Answer explanation

The general formula for alkanes is CnH2n+2, where n represents the number of carbon atoms in the alkane chain.

Name the simplest alkene.

• Ethene

• Butene

• Methene

• Propene

Answer explanation

The simplest alkene is Ethene, which consists of two carbon atoms bonded by a double bond. Therefore, the correct choice is Ethene.

Which hydrocarbons are known for their ring structure?

• Aromatic hydrocarbons

• Cyclic hydrocarbons

• Saturated hydrocarbons

• Aliphatic hydrocarbons

Answer explanation

Aromatic hydrocarbons are known for their ring structure, making them the correct choice in this case.

What type of reaction is combustion of hydrocarbons?

• Endothermic reaction

• Neutralization reaction

• Exothermic reaction

• Oxidation reaction

Answer explanation

The combustion of hydrocarbons is an exothermic reaction, releasing heat energy as it occurs.

Explain the concept of isomerism in hydrocarbons.

• Isomerism in hydrocarbons is the presence of compounds with different molecular and structural formulas.

• Isomerism in hydrocarbons is when compounds have the same molecular and structural formulas.

• Isomerism in hydrocarbons refers to compounds with different molecular formulas but the same structural formulas.

• Isomerism in hydrocarbons is the existence of different compounds that have the same molecular formula but different structural formulas.

Answer explanation

Isomerism in hydrocarbons is the existence of different compounds that have the same molecular formula but different structural formulas.

What property of hydrocarbons makes them good fuels?

• Low energy content and heat release

• High energy content and slow release

• Low energy content and slow release

• High energy content and heat release

Answer explanation

Hydrocarbons make good fuels due to their high energy content and heat release, providing efficient energy when burned.

Provide an example of an application of hydrocarbons in daily life.

• Gasoline as fuel for vehicles

• Propane for industrial processes

• Kerosene for cooking

• Diesel for heating homes

Answer explanation

Gasoline is commonly used as fuel for vehicles, making it an example of an application of hydrocarbons in daily life.

How many carbon atoms are present in butane?

• 3

• 4

• 6

• 5

Answer explanation

Butane has 4 carbon atoms, so the correct answer is 4.

What is the double bond in alkenes composed of?

• one sigma bond and one pi bond

• two sigma bonds

• one sigma bond and one delta bond

• one pi bond and one delta bond

Answer explanation

The double bond in alkenes is composed of one sigma bond and one pi bond.

Name a common aromatic hydrocarbon.

• Methane

• Toluene

• Ethanol

• Benzene

Answer explanation

Benzene is a common aromatic hydrocarbon due to its ring structure and delocalized electrons, making it highly stable and widely used in various industries.