So it's coming out for some work on mechanisms. The next one we'll go back up is a lecture for education. What we're looking at here, whenever there's a double bond straight away out of it, you can see here, as soon as a double bond, you can add to it. What can you add? HBR, HH, or BR, BR. So bromine, hygiene, or hygiene bromide. Any of those will do. What happens, I hope it's bromine, it's going to get up before it's as close as it's a double bond, as it's as negative, it's further from the double bond. The electrons move from the double bond to the bromine, the electrons from that double bond move to there. Then we get this intermediate with carbol cation and the bromine attached. Then the carbol cation, a tertiary carbol cation, it's more stable as secondary and a primary. When you bromine, you fall into previously, so that that halve is giving you a finer product.