After a positive bromine water test, the double bond is converted into which type of bond in the product?

After a positive bromine water test, the double bond is converted into which type of bond in the product?

• A. A dibromo compound
• B. A monobrominated compound
• C. An alcohol with bromine
• D. A brominated aromatic

Answer: (A)

Bromine water turning colorless shows that bromine adds across the carbon–carbon double bond. The Br2 molecule splits and each carbon of the former C=C forms a new bond to bromine. So the double bond is converted into two C–Br single bonds, yielding a vicinal dibromide (a dibrominated product). The other options don’t fit because they would require only one bromine adding, formation of an alcohol with bromine, or bromination of an aromatic ring, which isn’t what happens in this test.

Bromine water turning colorless shows that bromine adds across the carbon–carbon double bond. The Br2 molecule splits and each carbon of the former C=C forms a new bond to bromine. So the double bond is converted into two C–Br single bonds, yielding a vicinal dibromide (a dibrominated product). The other options don’t fit because they would require only one bromine adding, formation of an alcohol with bromine, or bromination of an aromatic ring, which isn’t what happens in this test.