Write a chemical equation to show the preparation of ethyne from dehalogenation of 1,2-dihalide and a tetrahalide

Dehalogenation of 1,2-Dihalide:
CH₂Cl-CH₂Cl → C₂H₂ + 2HCl (In the presence of Zn and heat)

Dehalogenation of Tetrahalide:
C₂Cl₄ → C₂H₂ + 2Cl₂ (In the presence of Zn and heat)