Question

Write the chemical equation for the preparation of ethene from below,
a) alkyl halides
b) vicinal dihalide

Answer 1

(A) It can be prepared by WURTZ Reaction

$C{H}_{3}Cl+C{H}_{3}Cl\stackrel{sodiumindryether}{\to }{C}_2{H}_6$

(B) Alkynes are obtained from vicinal dihalides by dehydrohalogenation which is carried out in two steps:

The first step is to prepare unsaturated halides. The halides formed have a halogen attached to a double bonded carbon. These halides are called vinylic halides which are not reactive in nature.