AQA A Level · Chemistry 7405

Introduction to organic chemistry: Practice Questions

5 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Introduction to organic chemistry.

8 questions20 marksFree, no account

Question 1

1 mark

Which of the following represents the correct IUPAC name for the compound with the structural formula \(\text{CH}_3\text{CH(CH}_3\text{)CH(OH)CH}_2\text{CHO}\)?

Question 2

1 mark

How many structural isomers with the molecular formula \(\text{C}_4\text{H}_9\text{Br}\) contain a primary carbon bonded to the halogen atom?

Question 3

1 mark

Which of the following compounds exhibits E-Z (stereoisomerism)?

Question 4

1 mark

Consider the alkene with the structural formula \(\text{CH}_3\text{CH}_2\text{C(CH}_3\text{)=C(Br)CH}_2\text{OH}\).
According to the Cahn–Ingold–Prelog (CIP) priority rules, which statement correctly identifies the higher priority group on each carbon atom of the double bond?

Question 5

1 mark

How many structural isomers (including chain, position, and functional group isomers) have the molecular formula \(\text{C}_3\text{H}_6\text{O}_2\) and react with sodium hydrogencarbonate to release carbon dioxide gas?

Question 6

3 marks

Give the systematic IUPAC name for the organic compound with the structural formula \(\text{CH}_3\text{CH}(\text{CH}_3)\text{CH}_2\text{CH}(\text{OH})\text{CH}_3\), and state the specific type of structural isomerism shown between this compound and 4-methylpentan-1-ol.

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Question 7

5 marks

Consider the stereoisomers of 3-methylpent-2-ene.
State the stereochemical descriptor ( extit{E} or extit{Z}) assigned to the isomer in which the \(-\text{CH}_3\) group at carbon-2 and the \(-\text{CH}_2\text{CH}_3\) group at carbon-3 are on the same side of the double bond, and explain your assignment using the Cahn–Ingold–Prelog (CIP) priority rules.

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Question 8

7 marks

A student investigates four unbranched structural isomers, A, B, C, and D, each having the molecular formula \(\text{C}_5\text{H}_{10}\text{O}\) and containing an unbranched five-carbon chain.

(a) Isomer A is an aldehyde.
(i) Give the IUPAC name for isomer A.
(ii) Draw the skeletal formula of isomer A.

(b) Isomer B and Isomer C are both ketones.
(i) Give the IUPAC name for isomer B and the IUPAC name for isomer C.
(ii) State the type of structural isomerism shown between isomer B and isomer C.

(c) Isomer D is an alkene that contains a primary alcohol group (\(-\text{CH}_2\text{OH}\)) and exhibits stereoisomerism.
(i) State the IUPAC name of isomer D, excluding stereochemical descriptors.
(ii) Explain why isomer D exhibits \(E\)-\(Z\) isomerism.
(iii) Draw the displayed formula of the \((E)\)-isomer of D.
(iv) State the Cahn-Ingold-Prelog (CIP) priority rules and use them to justify why this isomer is assigned the \(E\) configuration.

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