Question

Write down the mechanism for the reaction between chlorine and ethane to form chloroethane.

Answer 1

this is a radical reaction. u start by either adding chlorine in uv light or heat to produce two radical chlorine atoms as it then produces a chain of reactions forming the more stable product. 1-chloroethane.

Answer 2

Initiation
Cl2 -> 2Cl∙ (UV light above arrow)

Propagation
C2H6 + Cl∙ -> ∙C2H5 + HCl
(some more propagation steps here which arent necessary)

Termination
∙C2H5 + Cl∙ > C2H5Cl

Hope this helped