Explanation:

- Option 1: Magnesium bisulphite

- It's typically used in the paper industry and not as a pesticide or igniting agent.

- Option 2: Aluminium phosphide

- It's a fumigant for cereals and an igniting agent in flares.

- Releases phosphine gas, which is toxic to insects and rodents.

- Commonly used for pest control in stored grain.

- Option 3: Hydrogen peroxide

- Used as a disinfectant and bleaching agent, not as a pesticide or igniting agent.

- Option 4: Ethanoic acid

- This is another name for acetic acid, mainly used as a vinegar constituent.