The question asks to identify compound $(Z)$ in a reaction sequence, but the actual reaction sequence/image is missing from the prompt. Also, the structures corresponding to options A, B, C, D are not provided.

So, it is not possible to derive $(Z)$ step-by-step from the given information alone.

What is missing

1. The reaction scheme showing the starting compound and reagents.
2. The structures of options A, B, C, and D.

Without these, no chemical transformation can be analyzed.

Comparison with stored correct answer

The stored correct answer is B, but since the reaction sequence and options are absent, I cannot independently verify whether B is actually correct.