Question

What is the product of ethene mixed with bromine?

Answer 1

In an inert solvent `"1,2-dibromoethane"` is the likely product.

Explanation:

Ethylene is an electron-rich nucleophile, and bromine is a potential electrophile.

`H_2C=CH_2 +` `""^(delta+)Br-Br^(delta-)` `rarr H_2^+C-CH_2-Br + Br^-` `rarr BrH_2C-CH_2Br`

After the first addition, of course the intermediate is on the lookout for a nucleophile; bromide ion can fit the bill.