Here's why:

* Chlorine is a highly reactive gas. It can react violently with many substances, including alcohol.

* The reaction produces harmful byproducts. These include chlorinated hydrocarbons, which are known to be toxic and carcinogenic.

* The reaction can be explosive. The heat released from the reaction can ignite the alcohol, leading to a fire or explosion.

It's important to understand that even small amounts of chlorine and alcohol can react dangerously. Do not attempt to mix these substances under any circumstances.

If you're working with chlorine, make sure to follow all safety guidelines and wear appropriate protective equipment.