Which of the following is not recommended to deactivate the toxin of a jellyfish?

The use of bleach to deactivate the toxin of a jellyfish is not recommended due to the harmful chemical properties and potential for severe skin irritation. Bleach can cause further injury to the skin and does not neutralize the venom effectively.

In contrast, other options provide beneficial properties when treating jellyfish stings. Baking soda can help to alleviate pain and itching by altering the pH of the skin. Vinegar is often recommended as it can neutralize the venom from certain species of jellyfish, particularly box jellyfish, and can help prevent additional nematocysts from firing. Rubbing alcohol, while not as commonly recommended, can also assist in cleaning the area and managing discomfort.

Overall, the choice of not using bleach is based on safety and effectiveness in managing jellyfish stings.