Reactions of Alkenes & Alcohols Practice Questions

The general formula of the alkenes is $C_nH_{2n}$.

Give the molecular formula of pentene.

Butene is unsaturated but butane is saturated.

Explain why butene is described as unsaturated.

Draw the fully displayed structural formula of propene.

Complete Table 1.

Give the functional group found in all alcohols.

Give one use of ethanol.

Ethanol can be made by the fermentation of a sugar solution.

Name the substance that is added to the sugar solution to make fermentation happen.

Name the two products formed when an alkene burns in plenty of air.

Balance the equation for the complete combustion of ethene.

$\mathrm{C_2H_4} + \underline{\hspace{1.5cm}}\ \mathrm{O_2} \rightarrow \underline{\hspace{1.5cm}}\ \mathrm{CO_2} + \underline{\hspace{1.5cm}}\ \mathrm{H_2O}$

Alkenes tend to burn in air with a smoky flame.

Explain why.

Ethene reacts with hydrogen to produce ethane.

Give the catalyst and the temperature used in this reaction.

Draw the fully displayed structural formula of the product formed when ethene reacts with chlorine.

Name the type of reaction that takes place between ethene and chlorine.

Name the catalyst used in this reaction.

Give two other conditions used in this reaction.

Draw the fully displayed structural formula of the ethanol molecule produced in this reaction.

Give the letter of the compound that is an alcohol.

Name this compound.

A small piece of sodium is added to a test tube containing compound B.

Describe what would be seen, and name the gas produced.

Compound B is added to water and the mixture is stirred.

Describe what happens.

Compound B is warmed with an oxidising agent such as potassium dichromate.

Name the organic compound produced and give its functional group.

Which one of these is the formula of a carboxylic acid?

Tick (✓) one box.

• $\mathrm{CH_3CH_2CH_2OH}$
• $\mathrm{C_3H_6}$
• $\mathrm{CH_3CH_2COOH}$
• $\mathrm{CH_3OCH_3}$

Describe the solution formed when ethanoic acid dissolves in water.

Ethanoic acid is added to sodium carbonate.

Complete the word equation for the reaction.

ethanoic acid + sodium carbonate → $\underline{\hspace{3cm}}$ + $\underline{\hspace{3cm}}$ + $\underline{\hspace{3cm}}$

Describe a test to show that the gas given off in part (c) is carbon dioxide.

Give the result of the test.

Name the alcohol and the carboxylic acid that react together to produce ethyl ethanoate.

Name the type of substance used as a catalyst in this reaction.

Draw the fully displayed structural formula of ethanoic acid.

Write an equation to show the ionisation of propanoic acid in aqueous solution.

A solution of $0.1\ \mathrm{mol/dm^3}$ propanoic acid has a higher pH than a solution of $0.1\ \mathrm{mol/dm^3}$ hydrochloric acid.

Explain why.

Compare these two methods of producing ethanol.

In your answer you should refer to:

• the raw materials used
• the conditions used
• the product obtained.

Alkene X has a relative formula mass ($M_r$) of 70.

Show that the molecular formula of X is $\mathrm{C_5H_{10}}$.

Propene reacts with iodine.

Draw the fully displayed structural formula of the product of this reaction.

Explain why the product formed in part (b) is described as saturated.