Statement I: Acetylene (C₂H₂) is used in the oxy- acetylene flame for welding and cutting metals because it produces a very high temperature flame when burned with oxygen. This statement is correct. Statement II: Acetylene is an important organic chemical used as a building block (monomer) in the synthesis of various plastics, including polyvinyl chloride (PVC), neoprene rubber, and vinyl acetate. This statement is correct. Statement III: Acetylene is typically obtained industrially by the incomplete combustion of hydrocarbons like methane or by the reaction of calcium carbide (CaC₂) with water. The reaction with silicon carbide (SiC) and water does not produce acetylene. This statement is incorrect.
Consider the following statements about acetylene: I. It is used in welding industry. II. It is raw material for preparing plastics. III. It is easily obtained by mixing silicon carbide and water. Of these statements:
Asked in UPPCS Prelims 1998 · Topic: Hydrocarbons (Alkynes: Preparation, Physical and Chemical Properties)
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