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

Which species contains the same number of neutrons as $^{14}_{6}\text{C}$ and the same number of electrons as $^{23}_{11}\text{Na}^+$?

2024 Spring

MCQ

CH5 - CHEMICAL ENERGETICS

Which process has the largest enthalpy change per mole?

2024 Spring

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Which sodium compound contains 74.2% by mass of sodium?

2024 Spring

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

What is the maximum volume of sulfur dioxide gas measured at room conditions produced from burning 100\,\text{dm}^3 of diesel fuel containing 0.834\,\...

2024 Spring

MCQ

CH14 - AN INTRODUCTION TO ORGANIC CHEMISTRY

Which row shows the correct number of covalent bonds in a molecule of methylpropene? [Table_1]

2024 Spring

MCQ

CH3 - CHEMICAL BONDING

Aluminium chloride exists as $\text{Al}_2\text{Cl}_6$ molecules at room temperature. When heated to a high temperature, $\text{AlCl}_3$ molecules are ...

2024 Spring

MCQ

CH4 - STATES OF MATTER

The table shows the physical properties of four substances. Which substance has a giant covalent structure?

2024 Spring

MCQ

CH4 - STATES OF MATTER

At room temperature and pressure, $\text{H}_2\text{O}$ is a liquid and $\text{H}_2\text{S}$ is a gas.What is the reason for this difference of state?

2024 Spring

MCQ

CH5 - CHEMICAL ENERGETICS

The enthalpy change for a reaction can be calculated from values of:• enthalpies of formation, $\Delta H^{\circ}_f$• enthalpies of combustio...

2024 Spring

MCQ

CH5 - CHEMICAL ENERGETICS

Which reaction has an enthalpy change equal to the standard enthalpy change of formation of propane?

2024 Spring