Acetylene, also known as ethyne, is a hydrocarbon compound with the chemical formula C2H2. It is a colorless gas that is highly flammable and has a distinct odor. Acetylene is widely used in various industries, including welding and cutting operations, due to its high temperature flame.

There are several methods to obtain acetylene, and each method involves a different chemical reaction. Let's examine the options provided and explain how acetylene can be obtained through these reactions:

(A) HCOOK (electrolysis):
- In this method, acetylene can be obtained by the electrolysis of potassium formate (HCOOK).
- Electrolysis is the process of using an electric current to drive a non-spontaneous chemical reaction.
- The electrolysis of HCOOK results in the formation of acetylene gas (C2H2) at the anode.

(B) 2CHI3 + 6Ag:
- This reaction involves the combination of two molecules of iodoform (CHI3) with six molecules of silver (Ag).
- The result of this reaction is not acetylene, but rather silver acetylide (Ag2C2).
- Silver acetylide is a highly explosive compound that can decompose to release acetylene gas.

(C) C2H5OH (conc. H2SO4 at 443°C):
- In this method, acetylene can be obtained from the dehydration of ethanol (C2H5OH) in the presence of concentrated sulfuric acid (H2SO4) at a high temperature of 443°C.
- The concentrated sulfuric acid acts as a catalyst, promoting the removal of water molecules from ethanol to form acetylene.

(D) Be2C + H2O:
- This reaction involves the reaction of beryllium carbide (Be2C) with water (H2O).
- However, this reaction does not produce acetylene. It results in the formation of beryllium hydroxide (Be(OH)2).

To summarize, acetylene can be obtained through the electrolysis of potassium formate (HCOOK) or the dehydration of ethanol (C2H5OH) in the presence of concentrated sulfuric acid (H2SO4). It is important to note that acetylene is a highly flammable gas and should be handled with caution due to its hazardous nature.