The number of \(\sigma\) bonds, \(\pi\)-bonds, and lone pairs of electrons present in the product Z in the given reaction sequence are respectively:
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The presence of metals in organic reactions often hints at complex formation or coordination chemistry, which may alter typical bonding patterns seen in simpler organic molecules.
1. The given reaction starts with 1,2-dibromoethane, which undergoes zinc reduction to form ethene (C\(_2\)H\(_4\)).
2. In the presence of \( \text{H}^+ \)/H\(_2\)SO\(_4\), ethene undergoes rearrangement, leading to the formation of cyclopropane derivatives.
3. The final step involves heating with Cu at 573K, which facilitates further rearrangement leading to a conjugated system containing \( \sigma \) and \( \pi \) bonds, as well as lone pairs on heteroatoms.
