Give the method of preparation of ethyne by: 1,2-dibromoethane.

Name the organic compound which:

(a) is a tetrahedral molecule.

(b) is a planar molecule.

(c) is a linear molecule.

(d) forms a red precipitate with ammoniacal solution of copper (I) chloride.

(e) is known as paraffin.

(f) is known as olefin.

(g) will give ethyne (acetylene) gas when treated with water.

Give a chemical test to distinguish between

(a) saturated and unsaturated compounds

(b) ethane and ethene

(c) ethene (ethylene) and ethyne (acetylene)

Compound X is bubbled through bromine dissolved in carbon tetrachloride;

(a) Draw the structure of X.

(b) State your observation during the reaction.