Describe the Nelson's cell method for the preparation of chlorine. 

(i) Why could fluorine not be prepared for a long time from HF and metal fluorides either by electrolysis or by any chemical reaction ? (ii) Describe the modern method for the preparation of fluorine by giving: (a) Materials used in the construction of the cell. (b) Electrolyte used. (c) Electrode reactions.

Describe two methods for the preparation of acetone.

Describe the important methods for the preparation of alkenes.

Describe the important methods for the preparation of alkynes.

Briefly describe the Bredig's arc method for the preparation of lyophobic colloids.

Describe Kolbe's electrolytic method for the preparation of methane.

Loewig method is used for the preparation of

Describe some important methods for the preparation of alkanes. Discuss the substitution reactions of alkanes.

Describe four general methods for the preparation of saturated monocarboxylic acids.