Question

what is cyclic polymerisation? plzz give explanation........

Answer 1

Any process in which monomers combine chemically to produce a polymer. The monomer molecules — which in the polymer usually number from at least 100 to many thousands — may or may not all be the same. In nature, enzymes carry out polymerization under ordinary conditions to form proteins, nucleic acids, and carbohydrate polymers; in industry, the reaction is usually done with a catalyst, often under high pressure or heat. In addition polymerization, monomers are added successively to the reactive ends of a growing polymer molecule, similar to adding links to a chain; during the reactions, no by-products are formed. In condensation polymerization, growth of the polymer advances stepwise — monomers having reactive functional groups combine into larger molecules with their own functional groups; each reaction splits off a small molecule, often water, as a by-product.

Answer 2

Polymerisation is the process by which monomers or simple molecules combine or react with each higher giving polymers. 
Alkynes react with each other or add to each other giving cyclic compounds which are more bulkier. This process is called cyclic polymerisation. 
eg. 3 CH≡ CH →  Benzene in presence of hot iron tube as catalyst

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