Question

Give equation for reaction between ethyne with:

i) Bromine in carbon tetrachloride

ii) Hydrogen chloride

iii) Mercuric sulphate and dilute sulphuric acid at 333 K​

Answer 1

Explanation:

Halogens, especially chlorine and bromine on reaction with alkynes readily produces tetra-halogen derivatives of alkane. The reaction is carried out in inert solvent like carbon tetrachloride.

Due to the presence of two n-bonds, each molecule of the alkyne can react with two molecules of the halogen.

One mole of Bromine with ethyne gives 1,2-dibromoethene.

HC≡CH+Br

2

CCl

4

H(Br)C=C(Br)H