Which of the following reactions leads to the production of bleaching powder?

Correct option is B

​Correct option: (b), $$Ca(OH)_2 + Cl_2 \rightarrow CaOCl_2 + H_2O$$

​The production of bleaching powder involves the following reaction: 

$$Ca(OH)_2 +Cl_2 \rightarrow CaOCl_2 + H_2O$$ 

In this reaction:

• ​Calcium hydroxide (Ca(OH)₂) reacts with chlorine gas (Cl₂) to produce bleaching powder (Ca(OCl)₂) and water (H₂O).
  
• ​Bleaching powder, also known as calcium oxychloride, is widely used as a disinfectant and in water treatment processes.