Given below are two statements:
Statement I : Pure Aniline and other arylamines are usually colourless.
Statement II : Arylamines get coloured on storage due to atmospheric reduction
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement I : Pure Aniline and other arylamines are usually colourless.
Statement II : Arylamines get coloured on storage due to atmospheric reduction
In the light of the above statements, choose the most appropriate answer from the options given below:
- A.Both Statement I and Statement II are incorrect
- B.Statement I is incorrect but Statement II is correct
- C.Statement I is correct but Statement II is incorrect
- D.Both Statement I and Statement II are correct
Show answer and solution
Correct option: C
Solution
Pure aniline and other arylamines are indeed colourless liquids, so Statement I is correct. However, they turn coloured (yellow to brown) on storage due to atmospheric oxidation, not reduction — oxygen in air oxidises the aromatic amine to form coloured quinone-type products and other oxidised impurities. Since Statement II incorrectly states "atmospheric reduction," it is wrong.
[JEE Main 2023 · 24 Jan · Shift 2]