1. (a) How is ethene converted into ethyl magnesium bromide?
(b) What is HDPE? How is it prepared? Give its uses
Answers
a) Preparation. Ethylmagnesium bromide is commercially available, usually as a solution in diethyl ether or tetrahydrofuran. It may be prepared in the normal manner of Grignard reagents — by reacting bromoethane with magnesium in diethyl ether: EtBr + Mg → EtMgBr.
b) High-density polyethylene (HDPE) or polyethylene high-density (PEHD) is a thermoplastic polymer produced from the monomer ...
a)Ethene converted into ethyl magnesium bromide
b) Preparation of HDPE and its uses are given
Explanation:
Ethene
It is an unsaturated compound in which there is one C-C double bond .
Its general formula is CnH₂n
Grignard reagent
It is alkyl or phenyl magnesium halide
Its general formula is RMgX
- Conversion of Ethene to Ethyl magnesium bromide
Firstly , ethene is made to react with HBr and the product formed is Bromoethane as shown below :
Ethene + HBr ----> Bromoethane
Then this bromoethane is made to react with Mg in presence of diethyl ether and as a result we get : Ethyl magnesium bromide .
Bromoethane + Mg----> C₂H₅MgBr + H₂
(diethyl ether)
HDPE
It stands for high density polyethylene
Preparation
It is a hydrocarbon polymer prepared from ethylene/petroleum by a catalytic process.
In this high heat is passed over petroleum (cracking ).
This cracking leads to production of ethylene gas .
This ethylene gas so produced will aggregate to form polymer that is polyethylene .
Uses
It is used in making bottle caps
It is used to make food storing containers
It is used to make folding chairs etc