If bromine water remains orange when mixed with a hydrocarbon, it indicates that the hydrocarbon is saturated (for example, an alkane).

🧪 Quick Scoop: What this test means

When you add bromine water (orange solution) to a hydrocarbon:

  • If the orange colour disappears (goes colourless), the hydrocarbon is unsaturated (it has C=C double bonds, like alkenes).
  • If the orange colour remains , the hydrocarbon is saturated (it has only C–C single bonds, like alkanes).

So in your exact question:

“If bromine water remains orange when mixed with a hydrocarbon, it indicates that it is what type of hydrocarbon?”

Answer: It is a saturated hydrocarbon (an alkane).

Why the colour stays orange

  • Unsaturated hydrocarbons react with bromine in an addition reaction, breaking the double bond and removing bromine from solution, so the colour fades.
  • Saturated hydrocarbons do not react under these conditions, so the bromine just stays in solution and keeps its orange colour.

TL;DR: Orange colour stays = saturated hydrocarbon (alkane).

Information gathered from public forums or data available on the internet and portrayed here.