1)What are allyl chlorides & what are freons & its use?

2)What are enantiomeric pairs ?

3)We prepare alkyl iodide from alcohol & HI in presence of KI & 95% H3PO4 ,why we donot use H2SO4 in this process & Whats this process called?

A-1) Allyl chloride is an organic compound in which the chlorine atom is attached to the sp3-hybridised carbon atom next to carbon-carbon double bond (C=C) i.e. to an allylic carbon. The formula of the compound is CH2=CH-CH2Cl. 

The chlorofluorocarbon compounds of methane and ethane are collectively known as freons. They are used in refrigerators, aerosol propellants, air conditioners etc. 

A-2) Enantiomers are defined as the stereoisomers of a compound which are related to each other as non-superimposible mirror images. Enantiomers possess identical physical properties - namely melting point, boiling point, solubility, refractive index etc. They differ only with respect to the sign of specific rotation. One of the enantiomers rotates plane of polarisation to the left and is called laevotrorotatory, while the other one rotates the plane of polarisation to the right and is called dextrorotatory. Following are the enantiomers of tartaric acid

  

A-3) In the presence of sulphuric acid (H2SO4), KI produces HI

Since is an oxidizing agent, it oxidizes HI (produced in the reaction to I2).

As a result, the reaction between alcohol and HI to produce alkyl iodide cannot occur. Therefore, sulphuric acid is not used during the reaction of alcohols with KI. Instead, a non-oxidizing acid such as H3PO4 is used.

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 1) Allyl chloride is the organic compound with the formula CH2=CHCH2Cl. This colorless liquid is insoluble in water but soluble in common organic solvents. It is mainly converted to epichlorohydrin, used in the production of plastics. It is a chlorinated derivative of propylene.

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