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.

Name the products formed and write an equation when ethyne is added to the following in an inert solvent:

(a) chlorine

(b) bromine

(c) iodine

(d) hydrogen

(e) excess of hydrochloric acid.

Substitution reactions are characteristic reactions of …………… (alkynes/alkenes/alkanes).