What general purpose does the bromine water test serve in organic chemistry?

What general purpose does the bromine water test serve in organic chemistry?

• A. Detects carbon-carbon double bonds
• B. Detects hydroxyl groups
• C. Detects carbon-nitrogen single bonds
• D. Detects halide ions

Answer: (A)

The test is used to check for unsaturation, specifically carbon–carbon double bonds, in organic molecules. Bromine water is an orange‑brown solution that reacts with alkenes by adding bromine across the C=C bond, forming a dibromo compound and removing the color. So the solution decolorizes when a double bond is present. If there are no carbon–carbon double (or triple) bonds, no reaction occurs and the bromine color remains. This clarifies that the test signals unsaturation, not hydroxyl groups, C–N bonds, or halide ions, which are identified by other methods.

The test is used to check for unsaturation, specifically carbon–carbon double bonds, in organic molecules. Bromine water is an orange‑brown solution that reacts with alkenes by adding bromine across the C=C bond, forming a dibromo compound and removing the color. So the solution decolorizes when a double bond is present. If there are no carbon–carbon double (or triple) bonds, no reaction occurs and the bromine color remains. This clarifies that the test signals unsaturation, not hydroxyl groups, C–N bonds, or halide ions, which are identified by other methods.