Traces of bromine contamination are found in the 1,2-dibromoethane. Washing with

Question

Traces of bromine contamination are found in the 1,2-dibromoethane. Washing with which of the following would best remove the bromine?

The answer is cold, dilute aqueous sodium hydroxide but I don't get why.

Also what would be the best way to test whether the pure 1,2-dibromoethane contained any bromine?

The answer is to add chlorine water and look for the brown bromine color but if bromine is present wouldn't the solution itself have brown bromine color without adding chlorine water?

It sounds like chlorine is for substitution but how does that detect bromine?

Some good explanation would be much appreciated!

Explanation / Answer

cold dilute aqueous NaOH reacts with Bromine forming sodium bromide and sodium bromate so the bromine gets used up completely while the NaOH will not be able to replace the H from the strong covalent bond in 1,2 dibromo ethane so they don't react and so it is the best to be used to get rid of bromine without affecting the main compound.

1,2 dibromoethane turns brown on exposure to light so it may get difficult to differentiate between it and bromine since both of them have brown colour

bromine ions react with chlorine water to give yellow brown colour of the bromine which detects the present of bromine in it

Hope it helps!!Feel free to ask for further explanation in comment!! :)

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