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Amines (A-level only)

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Question 17

Aqueous solutions of propylamine (CH3CH2CH2NH2\text{CH}_3\text{CH}_2\text{CH}_2\text{NH}_2CH3​CH2​CH2​NH2​), ammonia (NH3\text{NH}_3NH3​), and phenylamine (C6H5NH2\text{C}_6\text{H}_5\text{NH}_2C6​H5​NH2​) are prepared with equal concentrations at the same temperature.

Which of the following represents the correct order of decreasing pH of these solutions?

A

C6H5NH2>NH3>CH3CH2CH2NH2\text{C}_6\text{H}_5\text{NH}_2 > \text{NH}_3 > \text{CH}_3\text{CH}_2\text{CH}_2\text{NH}_2C6​H5​NH2​>NH3​>CH3​CH2​CH2​NH2​

B

CH3CH2CH2NH2>NH3>C6H5NH2\text{CH}_3\text{CH}_2\text{CH}_2\text{NH}_2 > \text{NH}_3 > \text{C}_6\text{H}_5\text{NH}_2CH3​CH2​CH2​NH2​>NH3​>C6​H5​NH2​

C

NH3>CH3CH2CH2NH2>C6H5NH2\text{NH}_3 > \text{CH}_3\text{CH}_2\text{CH}_2\text{NH}_2 > \text{C}_6\text{H}_5\text{NH}_2NH3​>CH3​CH2​CH2​NH2​>C6​H5​NH2​

D

CH3CH2CH2NH2>C6H5NH2>NH3\text{CH}_3\text{CH}_2\text{CH}_2\text{NH}_2 > \text{C}_6\text{H}_5\text{NH}_2 > \text{NH}_3CH3​CH2​CH2​NH2​>C6​H5​NH2​>NH3​

Markscheme

Amines (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Amines (A-level only)

26 exam-style questions on AQA A Level Chemistry Amines (A-level only), covering Preparation (A-level only), Base properties (A-level only), and Nucleophilic properties (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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