The question refers to "the following reaction", but the actual reaction scheme/structures and the option structures A–D are missing from the prompt.

So the product 'X' cannot be determined uniquely from the information provided.

Step-by-step assessment

1. To identify the major product in a question from Alcohols, Phenols and Ethers, I need the reaction details such as:

   • the starting substrate,
   • the reagent(s),
   • the conditions,
   • and the structures of options A, B, C, D.

2. In the current prompt, only this text is available:

   "The major product 'X' formed in the following reaction is :" but the actual reaction image/equation is absent.

3. Since the reaction is missing, any attempt to choose among A, B, C, D would be a guess rather than a valid chemical solution.

Conclusion

The question is incomplete, so the answer cannot be derived reliably.

Please provide the reaction scheme/image and the option structures so I can solve it properly step-by-step.

Comparison with stored correct answer

The stored correct answer is C, but because the reaction and options are missing, I cannot verify that choice from the given data.