Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

(a) In the following boxes draw the structural formulae of three alcohols having straight (i.e. unbranched) chains, with the molecular formula $C_5H_{...

2009 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Sorbic acid is used as a food preservative because it kills fungi and moulds.[Image_1: Sorbic acid structural formula]Sorbic acid will react withhydro...

2009 Winter

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

The characteristic odour of rum is attributed to the compound 2-ethyl-3-methylbutanoic acid.\[ \begin{align*} &\text{H}_3\text{C} &&&&&\text{CH}_3 \ &...

2009 Winter

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

The acarid mite releases extit{lardolure} to attract other mites to a host. This chemical can be destroyed by hydrolysis with acid. \[ \text{CH}_3\t...

2009 Winter

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Which compound is a product of the hydrolysis of $CH_3CO_2C_3H_7$ by boiling aqueous sodium hydroxide?

2010 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

When organic refuse decomposes in water carboxylic acids are formed. The water becomes acidic and aquatic life is destroyed.Which additives are suitab...

2010 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Which compound is a product of the hydrolysis of $CH_3CO_2C_3H_7$ by boiling aqueous sodium hydroxide?

2010 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

When organic refuse decomposes in water carboxylic acids are formed. The water becomes acidic and aquatic life is destroyed.Which additives are suitab...

2010 Summer

MCQ

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Propanoic acid occurs naturally as a result of the bacterial fermentation of milk, and is partly responsible for the flavour of Swiss cheese.Which sta...

2010 Summer

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Acyl chlorides are useful intermediates in organic syntheses.(a) (i) State a suitable reagent for converting carboxylic acids into acyl chlorides........

2010 Summer

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

This question refers to isolated gaseous atoms.In which atom are all electrons paired?

2018 Summer

MCQ

CH3 - CHEMICAL BONDING

Which compound has a boiling point that is influenced by hydrogen bonding?

2018 Summer

MCQ

CH14 - AN INTRODUCTION TO ORGANIC CHEMISTRY

Which fuel would produce the largest mass of CO$_2$ when 10 kg of the fuel undergo complete combustion?

2018 Summer

MCQ

CH5 - CHEMICAL ENERGETICS

The diagram shows the Boltzmann distribution of energies in a gas. The gas can take part in a reaction with an activation energy, $E_a$. The gas is ma...

2018 Summer

MCQ

CH14 - AN INTRODUCTION TO ORGANIC CHEMISTRY

Which molecule has no overall dipole?

2018 Summer

MCQ

CH3 - CHEMICAL BONDING

Which solid contains more than one type of bonding?

2018 Summer

MCQ

CH5 - CHEMICAL ENERGETICS

Enthalpy changes of combustion can be used to determine enthalpy changes of formation. The following equation represents the enthalpy change of format...

2018 Summer

MCQ

CH6 - ELECTROCHEMISTRY

Ethanedioate ions, $\text{C}_2\text{O}_4^{2-}$, react with a suitable reagent to form $\text{CO}_2$. A half-equation for this reaction is shown. $\te...

2018 Summer

MCQ

CH6 - ELECTROCHEMISTRY

Oxidation numbers should be used to answer this question.A redox reaction takes place between hydroxylammonium ions, $[\text{NH}_3\text{OH}]^+$, and a...

2018 Summer

MCQ

CH5 - CHEMICAL ENERGETICS

Element X has a higher first ionisation energy than element Y.Two students state what they believe is one factor that helps to explain this.student 1 ...

2018 Summer