Question

In a chemical experiment, 1, 1, 2, 2- tetrabromoethane is treated with alcoholic zinc to produce an unsaturated substituted hydrocarbon.

This process represents an example of

Answer 1

This is dehalogenation (more specifically reductive dehalogenation / reductive elimination). Alcoholic zinc removes bromine atoms from 1,1,2,2‑tetrabromoethane, producing the unsaturated (C=C) substituted hydrocarbon.