Alkanes vs Alkenes

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 statement is correct?

• Alkenes can turn aqueous bromine from reddish-brown to colourless.

• Alkenes can turn aqueous bromine from colourless to reddish-brown.

• Alkanes can turn aqueous bromine from reddish-brown to colourless.

• Alkanes can turn aqueous bromine from colourless to reddish-brown.

State the general formula for alkane

• C_nH_2n+2

• C_nH_2n

• C_nH_2n+1

• C_nH_2n-2

State the general formula for alkene

• C_nH_2n+2

• C_nH_2n

• C_nH_2n+1

• C_nH_2n-2

Which are the following are all alkenes?

• methane, ethane, propane

• methane, ethene, propene

• methene, ethene, propene

• ethene, propene, butene

The formula for ethene is

• C₂H₄

• C₂H₆

• CH₄

• C₃H₆

Alkanes react with excess oxygen to form

• carbon dioxide and water vapour

• salt and water

• carbon monoxide and soot

• metal hydroxide and hydrogen

Both alkanes and alkenes are

• hydrocarbons

• alcohols

• saturated

• unsaturated

An alkane is

• polyunsaturated

• polysaturated

• saturated

• unsaturated

Which of the following reactions apply to alkenes only

• cracking

• substitution

• addition

• combustion