Theory

CH23 - ORGANIC SYNTHESIS

Phenol and chlorobenzene are less reactive towards certain reagents than similar non-aromatic compounds. Thus hexan-1-ol can be converted into hexylam...

2009 Summer

Theory

CH23 - ORGANIC SYNTHESIS

This question is about the modern techniques of analysis which may be used to determine molecular structures.(a) In X-ray crystallography X-rays are d...

2009 Winter

Theory

CH23 - ORGANIC SYNTHESIS

Compounds J and K are isomers with the molecular formula $C_5H_{11}NO$, and they contain the same functional group.They may both be obtained from etha...

2009 Winter

Theory

CH23 - ORGANIC SYNTHESIS

(a) Some drugs have to be given by injection, rather than by mouth. Name a functional group in a drug molecule that might be broken down by the acid ...

2010 Summer

Theory

CH23 - ORGANIC SYNTHESIS

The following chart shows some reactions of ethylbenzene and compounds produced from it. (i) Draw the structure of compound X in the box provided in t...

2010 Winter

Theory

CH23 - ORGANIC SYNTHESIS

The following scheme outlines the production of some compounds from ethene.(a) (i) Suggest the reagent and conditions for reaction I.....................

2010 Winter

Theory

CH23 - ORGANIC SYNTHESIS

One of the greatest challenges facing scientists today is the development of effective drugs to treat different forms of cancer.(a) Drugs can be intro...

2010 Winter

Theory

CH23 - ORGANIC SYNTHESIS

(a) There are several ways of introducing chlorine atoms into organic molecules. State the reagents and conditions necessary to carry out the followin...

2011 Summer

Theory

CH23 - ORGANIC SYNTHESIS

(a) State the functional groups which the above four reagents test for.(i) $\text{Br}_2(\text{aq})$......................................................

2011 Winter

Theory

CH23 - ORGANIC SYNTHESIS

Compound C has the molecular formula $C_7H_{14}O$. Treating C with hot concentrated acidified $KMnO_4(aq)$ produces two compounds, D, $C_4H_8O$, and E...

2011 Winter

MCQ

CH2 - ATOMIC STRUCTURE

What could be the proton number of an element that has three unpaired electrons in each of its atoms?

2010 Summer

MCQ

CH2 - ATOMIC STRUCTURE

Use of the Data Booklet is relevant to this question.The elements radon (Rn), francium (Fr) and radium (Ra) have consecutive proton numbers in the Per...

2010 Summer

MCQ

CH4 - STATES OF MATTER

Which gas closely approaches ideal behaviour at room temperature and pressure?

2010 Summer

MCQ

CH5 - CHEMICAL ENERGETICS

Some bond energy values are listed below. [Table_1: ] These bond energy values relate to the following four reactions. P Br_2 \rightarrow 2Br Q ...

2010 Summer

MCQ

CH5 - CHEMICAL ENERGETICS

Given the following enthalpy changes,$I_2(g) + 3Cl_2(g) \rightarrow 2ICl_3(s) \quad \Delta H^\circ = -214 \text{ kJ mol}^{-1}$$I_2(s) \rightarrow I_2(...

2010 Summer

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Ammonium nitrate, NH$_4$NO$_3$, can decompose explosively when heated. NH$_4$NO$_3$ $\rightarrow$ N$_2$O + 2H$_2$O What are the changes in the oxidati...

2010 Summer

MCQ

CH20 - NITROGEN COMPOUNDS

The Haber process for the manufacture of ammonia is represented by the following equation. \( \text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\tex...

2010 Summer

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Use of the Data Booklet is relevant to this question. 2.920 g of a Group II metal, $X$, reacts with an excess of chlorine to form 5.287 g of a compou...

2010 Summer

MCQ

CH4 - STATES OF MATTER

Which mass of gas would occupy a volume of 3 dm$^3$ at 25°C and 1 atmosphere pressure? [1 mol of gas occupies 24 dm$^3$ at 25°C and 1 atmosphere pre...

2010 Summer

MCQ

CH7 - EQUILIBRIA

The table gives the concentrations and pH values of the aqueous solutions of two compounds, X and Y. Either compound could be an acid or a base.[Table...

2010 Summer