Sample Questions on Bromine Water Test
Question 1: What is the principle involved in the bromine water test?
Answer:
Principle involved in the bromine water test is based on the reaction between bromine and unsaturated compounds, specifically alkenes or alkynes. Bromine adds across carbon-carbon double or triple bonds, causing the characteristic reddish-brown color of bromine water to disappear. Saturated compounds, lacking double or triple bonds, do not undergo this reaction and do not show a color change.
Question 2: What is the function of sunlight in the bromine water and iodine solution tests?
Answer:
Sunlight is not typically a factor in the bromine water test. In contrast, the iodine solution test, which assesses the presence of starch, can benefit from sunlight.
Question 3: Which hydrocarbon is most easily oxidized by KMnO4 and which is most reactive towards bromine water?
Answer:
Alkenes are readily oxidized by potassium permanganate (KMnO4), leading to the decolorization of the purple KMnO4 solution. This reaction involves oxidative cleavage of the carbon-carbon double bond, forming diols. On the other hand, alkynes are highly reactive towards bromine water, causing the rapid disappearance of its reddish-brown color.
Question 4: What happens when D-glucose is treated with bromine water?
Answer:
When D-glucose is treated with bromine water, D- gluconic acid is produced and bromine water changes from reddish – brown to a colorless solution indicating the presence of unsaturation .
Bromine Water Test
Bromine Water Test is an important test in Practical Organic Chemistry that deals with detecting the presence of unsaturation, such as carbon-carbon (C-C) double or triple bonds in organic compounds, i.e. it is used to identify the presence of alkane or alkene in an organic compound.
In this article, we will discuss this test in detail, including the preparation of bromine water, the principle of the test, and various substances that undergo this test with their reactions.
Table of Content
- What is Bromine Water?
- Preparation of Bromine Water
- Principles of Bromine Water Test
- Bromine Water Test Reaction
- Bromine Water Test for Different Substances
- Application of Bromine Water Test