Cambridge International A Level · Chemistry (9701)

An introduction to AS Level organic chemistry: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on An introduction to AS Level organic chemistry.

10 questions24 marksFree, no account

Question 1

1 mark

A molecule of but-2-ene can exist as two different stereoisomers. What is the reason for this type of isomerism?

Question 2

1 mark

In the mechanism of free-radical substitution of ethane with chlorine, which step involves the reaction of two radicals to form a stable molecule?

Question 3

1 mark

Which species is classified as a nucleophile?

Question 4

1 mark

What is the empirical formula of a compound with the molecular formula \( C_6H_{12}O_6 \)?

Question 5

1 mark

What is the systematic IUPAC name for the straight-chain organic compound with the skeletal formula representing 5 carbon atoms and a nitrile functional group at the end of the chain?

Question 6

2 marks

Define the term hydrocarbon and state whether alkanes are classified as saturated or unsaturated molecules.

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Question 7

3 marks

Explain why alkanes are described as saturated hydrocarbons and state the bond angle around each carbon atom in an ethane molecule.

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Question 8

5 marks

Explain the term nucleophile and describe the movement of electrons, using curly arrows, in the first step of the reaction between a cyanide ion and an ethanal molecule.

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Question 9

4 marks

Organic compounds can be represented in various ways including skeletal and structural formulae.
(a) Define the term hydrocarbon.
(b) A straight-chain alkane has the molecular formula \( C_5H_{12} \). Give the IUPAC name and draw the skeletal formula for this compound.
(c) Alkanes are described as saturated molecules. State the meaning of the term saturated in this context.

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Question 10

5 marks

Organic reactions often involve the breaking of covalent bonds.
(a) Define the term homolytic fission and describe the species that are formed as a result.
(b) Heterolytic fission can occur in a molecule of chloromethane, \(CH_3Cl\). Use the concept of electronegativity to explain which atom will retain the electron pair during the fission of the \(C-Cl\) bond and identify the ions produced.
(c) Describe the movement of electrons in a heterolytic fission process using the standard curly arrow notation.

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