Final answer:
The bromobenzene is added to a reaction mixture using a dropping funnel or addition funnel, which allows for a controlled and safe addition of this chemical.
Step-by-step explanation:
To add bromobenzene to a reaction, a laboratory instrument known as a dropping funnel or addition funnel is typically used. This piece of equipment allows for the controlled addition of liquids to a reaction mixture. The dropping funnel has a stopcock at the bottom which controls the rate at which the bromobenzene is added to the reaction flask. This is particularly important in reactions where the rate of addition can affect the outcome or safety of the reaction.
For example, in the synthesis of aryl halides, careful addition of a halogen is crucial. In the case of adding bromine to a benzene ring to form a bromo derivative, such as p-bromotoluene or 4-bromotoluene, consistent and controlled addition ensures proper substitution and avoids potential side reactions. Therefore, using a dropping funnel helps maintain a safe and effective reaction condition, especially when handling reactive halogens like bromine.