-To extract the bromonitrobenzene from the reaction mixture -It causes excess br

ID: 885324 • Letter: #

Question

-To extract the bromonitrobenzene from the reaction mixture

-It causes excess bromine to be given off as a gas

-It is used to absorb excess heat generated by the exothermic reaction

-To neutralize any remaining acid

Why is dichloromethane added next to the reaction mixture?

-To crystalize the bromonitrobenzene

-It neutralizes excess acid in the reaction mixture

-It is used as a drying agent to remove water

-To extract the bromonitrobenzene from the acid mixture

When washing the aqueous sodium bicarbonate layer with dichloromethane, which layer contains the product?

-The product is an emulsion between the two layers

-The product is the dichloromethane layer

-The product is insoluble in both layers and precipitates out of solution

-The product is in the aqueous sodium bicarbonate layer

After removing the dichloromethane layer, why is it rinsed with saturated sodium chloride?

-To crystalize the bromonitrobenzene

-It causes the bromonitrobenzene to precipitate out of solution

-It is used as the drying agent to remove any excess water

-To remove any water soluble impurities from the dichloromethane layer

For the above given reaction,

After the reaction has gone to completion, the purpose of adding saturated sodium bicarbonate to the reaction mixture is,

-To neutralize any remaining acid

This ensures that all the acid remaining If any used for the reaction is neutralized before extracting the product.

Dichloromethane is added next to the reaction mixture for,

-To extract the bromonitrobenzene from the acid mixture

Organic product formed is extracted in organic solvent as Dichlormethane in this case.

When washing the aqueous sodium bicarbonate layer with dichloromethane, the layer containning the product is,

-The product is the dichloromethane layer

The organic product goes in the organic solvent layer during extraction.

After removing the dichloromethane layer, it is rinsed with saturated sodium chloride for,

-It is used as the drying agent to remove any excess water

During extraction water gets into the organic phase. This is removed by washing the layer with saturated NaCl (brine).

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