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Organic chemistry questions

Hello, I was doing a question which asked what reagent to add to produce a diiodoalkane when added to Methyl-1,4-cyclohexanediol (diagram: https://www.chemspider.com/Chemical-Structure.10606653.html). I said iodine solution because an alcohol plus a halogen is a dihaloalkane. But the actual answer is sodium iodide or potassium iodide plus sulphuric acid (the acid part I got). But now I’m confused because I thought alcohol plus sodium iodide made a haloalkane not a dihaloalkane. Can someone explain the mark scheme answer please

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