NEET 2010 Chemistry question

When glycerol is treated with excess of HI, it produces :

(1)2-iodopropaneCorrect
(2)allyl iodide
(3)propene
(4)glycerol triiodide

Answer: (1)

Solution

Glycerol reacts with HI (warm) to form 1,2,3-triiodopropane, , which is unstable and loses to give allyl iodide, . With excess HI, allyl iodide adds HI (Markovnikov) to give the unstable 2,3-diiodopropane,

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Question ID VK-090379