Cambridge IGCSE · Chemistry (0620)

Formulae, functional groups and terminology: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Formulae, functional groups and terminology.

10 questions32 marksFree, no account

Question 1

1 mark

A molecule is described as being saturated. Which type of bond is found between all carbon atoms in this molecule?

Question 2

1 mark

Two molecules are described as being structural isomers of each other. Which feature must be the same for both molecules?

Question 3

1 mark

How many structural isomers exist for the molecular formula \(C_4H_{10}\)?

Question 4

1 mark

Which general formula represents the homologous series of alkanes?

Question 5

1 mark

A molecule of an organic compound is represented by the structural formula \(CH_3CH_2COOCH_3\).
Which homologous series does this compound belong to?

Question 6

2 marks

Define the term hydrocarbon.

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Question 7

5 marks

State three general characteristics shared by members of the same homologous series.

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Question 8

5 marks

An unbranched alkane has a relative molecular mass \((M_r)\) of 72. Using the general formula for alkanes, determine its molecular formula. (Relative atomic masses: \(C = 12\), \(H = 1\))

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Question 9

7 marks

The molecular formula \(C_4H_8\) represents several structural isomers.

(a) Define the term structural isomers.
(b) Define the term unsaturated hydrocarbon.
(c) There are two straight-chain isomers of \(C_4H_8\) that are alkenes. Draw the displayed formulae for both of these isomers.
(d) There is a third alkene isomer of \(C_4H_8\) that has a branched structure. Write the unambiguous structural formula for this branched isomer.
(e) Identify the functional group present in these isomers.

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Question 10

8 marks

Organic compounds are grouped into homologous series based on their structure and chemical behavior.

(a) State three general characteristics of a homologous series.

(b) Define the term structural isomers.

(i) Draw the displayed formulae for the two structural isomers of \( \text{C}_4\text{H}_{10} \).

(ii) Provide the systematic IUPAC names for both isomers identified in (c)(i).

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