The question statement is incomplete: the reaction sequence diagram and the structures of options A–D are missing. Because of that, the compound $I$ cannot be determined from the provided text alone.

What is missing

1. The actual reaction sequence after the phrase:

   "In the following reaction sequence: The compound $I$ is"

2. The structures of options A, B, C, D

Without these, there is no chemical information to analyze step-by-step.

Conclusion

Since the key reaction scheme is absent, I cannot genuinely derive the identity of compound $I$.

However, the stored correct answer is given as D. I cannot verify it from the available data, so I do not agree based on evidence.

If you share the reaction image or type out the sequence and options, I can solve it properly step-by-step.