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

Theory

CH2 - ATOMIC STRUCTURE

Fig. 1.1 shows how first ionisation energies vary across Period 2.(a) Construct an equation to represent the first ionisation energy of oxygen. Includ...

2022 Spring

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Some oxides of elements in Period 3 are shown.$\text{Na}_2\text{O}$\hspace{1cm}$\text{Al}_2\text{O}_3$\hspace{1cm}$\text{P}_4\text{O}_6$\hspace{1cm}$\...

2022 Spring

Theory

CH11 - GROUP 17

The hydrogen halides HCl, HBr and HI are all colourless gases at room temperature.(a) The hydrogen halides can be formed by reacting the halogens with...

2022 Spring

Theory

CH18 - CARBONYL COMPOUNDS

Compounds J and K are found in plant oils.[Image_1: Illustration of compounds J and K]Fig. 4.1(a) (i) Complete Table 4.1 to state what you would obser...

2022 Spring

Theory

CH7 - EQUILIBRIA

Iodine is found naturally in compounds in many different oxidation states.(a) Iodide ions, $\text{I}^-$, react with acidified $\text{H}_2\text{O}_2$(a...

2022 Spring

Theory

CH5 - CHEMICAL ENERGETICS

Silicon is the second most abundant element by mass in the Earth's crust.(a) In industry, silicon is extracted from SiO$_2$ by reaction with carbon at...

2022 Spring

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

Titanium is a transition element in Period 4. It is commonly found as TiO2 in minerals.(a) (i) Define transition element.................................

2022 Spring

Theory

CH14 - AN INTRODUCTION TO ORGANIC CHEMISTRY

Compounds F and J are shown in Fig. 4.1.Fig. 4.1(a) F and J both contain the arene functional group.(i) Identify...

2022 Spring

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

2-Chloropropanoic acid, CH₃CHClCOOH, is used in many chemical syntheses.(a) (i) An equilibrium is set up when CH₃CHClCOOH is added to water. Write...

2022 Spring

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Lidocaine is used as an anaesthetic. A synthesis of lidocaine is shown in Fig. 6.1.(a) W can be formed by reacting HOCH$_2$COOH with an excess of SOCl...

2022 Spring