Required practical: tests for alcohol, aldehyde, alkene and carboxylic acid.

In the subtopic Test-tube reactions and mass spectrometry, this AQA A-Level Chemistry 7405 learning objective focuses on required practical: tests for alcohol, aldehyde, alkene and carboxylic acid. It belongs to Organic analysis, so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include practical, tests, required, alcohol, aldehyde. Test-tube reactions. means experiments conducted in a test-tube to identify the presence of specific functional groups in organic compounds such as alcohols, aldehydes, alkenes, and carboxylic acids Avoid the mistake of students often confuse the tests for alcohols and aldehydes, leading to incorrect identification; instead, to correctly identify alcohols and aldehydes, remember that alcohols react with acidified potassium dichromate to produce a color change from orange to green, while aldehydes can be identified using Tollens' reagent, which produces a silver mirror. Use the following steps: 1. For alcohols, apply the formula: color change = orange to green. 2. For aldehydes, apply the formula: silver mirror = positive test. 3. Substitute the observed results into the identification process. 4. Conclude with the correct functional group based on the test results For exam answers, perform a test-tube reaction with the appropriate reagent for each functional group to confirm its presence