How to reactions of glycerol differ with excess HCl, HBr and HI ?

Both HCl and HBr give same pattern reaction while HI give different product 

Reaction of glycerol with limited amount of warmed HI gives allyl iodide.

While in the presence of excess amount of HI, then allyl iodide reduced to propene, which further reacts with HI and forms isopropyle iodide.

Related question:

How is glycerol obtained from propene?

How can you convert glycerol into Acrolein?

What is the product formed when glycerol react with Excess HI?

What is Noble’s oil and how can obtained from glycerol/glycerine?

What are different products obtained when glycerol is heated with oxalic acid at different temperature?

What is difference between Glycerol and Glucosamine ?

Glycerol is a three carbon containing trihydroxy alcohol its common name are  Glycerol or Glycerine  and it's IUPAC name is Propane-1,2,3-triol; 

Glucosamine  is an amino sugar and a prominent precursor in the biochemical synthesis of glycosylated proteins and lipids. and its molecular formula is (C₆H₁₃NO₅) and it structure is given below.

From above descriptions it is clear that Glycerol and Glucosamine both are different.

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What is Glycerol and write its IUPAC name ?

Glycerol is a three carbon containing trihydroxy alcohol its common name are  Glycerol or Glycerine  and it's IUPAC name is Propane-1,2,3-triol; 

Glycerol is prepared from Glycerides by treating with aq. NaOH. This reaction is also known as saponification reaction.

Related Questions:

What is Knocking?

What is fats and Oils ?

What is saponification reaction ?

What is the difference between oils and fats ?

What is Rancidification of oils or fats ?

What is saponification reaction ?

What is Glycerol and write its IUPAC name ?

What is Lewsite gas ?

What is British Anti Lewsite (BAL) ?

What is Lindlar’s catalyst and does Lindlar’s catalyst use ?

After the use of Pyrene (a fire extinguisher), the room should be ventilated.why?.

Which halogen best delocalises electron density to benzene ring ?

Both glucose and fructose are reducing sugars but sucrose is non-reducing in nature. Why?

How to arrange the isomeric hexanes in order of increasing stability at room temperature?

How to arrange the isomeric hexanes in order of increasing stability at room temperature?