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(A) When glycerol $(CH_2OH-CHOH-CH_2OH)$ is heated with excess hydriodic acid $(HI)$,it undergoes reduction. First,the hydroxyl groups are replaced by

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Propane

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(A) When glycerol $(CH_2OH-CHOH-CH_2OH)$ is heated with excess hydriodic acid $(HI)$,it undergoes reduction. First,the hydroxyl groups are replaced by iodine atoms to form $1,2,3-triiodopropane$. This compound is unstable and loses iodine to form allyl iodide $(CH_2=CH-CH_2I)$. Further reaction with $HI$ leads to the formation of $2-iodopropane$ $(CH_3-CH(I)-CH_3)$. Finally,the reduction of $2-iodopropane$ with $HI$ yields $2-iodopropane$ which further reduces to propane $(CH_3-CH_2-CH_3)$.

What is the final product obtained by the reduction of glycerol with hydriodic acid $(HI)$?

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