Reactions of Alkanes

Alkanes react with excess oxygen to form

• carbon dioxide and water vapour

• salt and water

• carbon monoxide and soot

• metal hydroxide and hydrogen

Alkanes undergo substitution by chlorine only in the presence of

• UV light

• oxygen

• water

• aqueous bromine

Which of the following can be used to distinguish between alkanes and alkenes?

• add a few drops of aqueous bromine

• add a few drops of Universal indicator

• add a piece of blue litmus paper

• add a piece of red litmus paper

Which of the following statements about cracking is not true?

• Cracking is the breakdown of large alkane molecules into small molecules.

• Cracking is used to produce fuel for motor vehicles.

• Cracking is used to produce H₂ and alkenes.

• Cracking takes place in the presence of sunlight.

What is the main type of reaction undergone by alkanes?

• Addition

• Substitution

• Elimination

• Condensation

What is the process called when a large alkane is broken down into smaller alkanes and alkenes?

• Polymerization

• Hydrogenation

• Cracking

• Halogenation

Alkanes react with halogens in the presence of

• UV light

• water

• oxygen

• carbon dioxide

Which of the following is a characteristic reaction of alkanes?

• Addition

• Substitution

• Elimination

• Condensation

What is the main product when alkanes undergo complete combustion?

• Carbon monoxide and water

• Carbon dioxide and water

• Carbon and water

• Hydrogen and water

Which catalyst is commonly used in the cracking of alkanes?

• Platinum

• Nickel

• Zeolite

• Iron