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

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Some intercontinental jet airliners use kerosene as fuel. The formula of kerosene may be taken as $C_{14}H_{30}$.(a) To which homologous series of com...

2011 Summer

Theory

CH15 - HYDROCARBONS

(a) (i) What is meant by the term `cracking` and why is it carried out?..................................................................................

2011 Summer

Theory

CH10 - GROUP 2

(a) State the formula of each of the calcium compounds U to Y.   U V W X Y (b) Compound Y may be converted into compound V. Out...

2011 Summer

Theory

CH18 - CARBONYL COMPOUNDS

Ketones are widely used as solvents and as intermediates in the chemical industry.Ketones contain the reactive keto group, $\text{C=O}$.(a) Propanone,...

2011 Summer

Theory

CH5 - CHEMICAL ENERGETICS

(a) When calcium carbide is reacted with water, ethyne and calcium hydroxide are formed. Construct a balanced equation for this reaction. (b) (i) Wh...

2011 Summer

Theory

CH7 - EQUILIBRIA

Ethanoic acid can be reacted with alcohols to form esters, an equilibrium mixture being formed.$$\text{CH}_3\text{CO}_2\text{H} + \text{ROH} \rightlef...

2011 Summer

Theory

CH16 - HALOGEN DERIVATIVES

(a) Use relevant bond energies from the Data Booklet, and the equation below to calculate a value for the bond energy of the C–F bond.CH$_2$ = CH$_2...

2011 Summer

Theory

CH10 - GROUP 2

(a) State the formula of each of the barium compounds R to W.R .................................... S ....................................T .............

2011 Summer

Theory

CH6 - ELECTROCHEMISTRY

(a) (i) Describe, with the aid of a fully labelled diagram, the industrial electrolysis of brine in a diaphragm cell. State what each electrode is mad...

2011 Summer

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Although there are many different types of food eaten around the world, animal fats and/or vegetable oils are commonly used in cooking.Animal fats and...

2011 Summer