Question

The product formed when acetylene is passed through red hot tube is:
A.Benzene
B.Cyclohexane
C.Neoprene
D.Ethane

Answer 1

Acetylene is an alkyne. The IUPAC name of acetylene is Ethyne. It contains a triple bond between the two carbon atoms.

Complete step by step answer:
An aromatic hydrocarbon, Benzene is formed when acetylene is passed through a red hot tube.
Reactant: Acetylene, $CH \equiv CH$
Condition: Red hot iron ( $Fe$) tube
Product formed: Benzene ${C_6}{H_6}$
Reaction: $3CH \equiv CH\xrightarrow[{FeTube}]{{\operatorname{Re} dHot}}{C_6}{H_6}$
This reaction takes place at a particular temperature, $873K$.
This is the basic reaction used in preparation of benzene. This reaction is also an example of catalytic conversion.

Thus option A. is the correct answer to the following question.

Additional information:
Preparation of cyclohexane using benzene
Reactant: Benzene ${C_6}{H_6}$
Condition: nickel, hydrogen($Ni,{H_2}$)
Product formed: cyclohexane(${C_6}{H_{12}}$)
Reaction: ${C_6}{H_6}\xrightarrow{{Ni,{H_2}}}{C_6}{H_{12}}$
Properties of acetylene:
-It has a garlic like smell.
-It is an industrial gas that is commercially used in the reaction of water and calcium carbide.
-It is a side product that is formed along with the formation of ethylene.

Note:
If the reagent is changed, that is nickel powder along with hydrogen is used, then the product formed is different.
Reactant: Acetylene, $CH \equiv CH$
Reagent: nickel, hydrogen($Ni,{H_2}$)
Product formed:Ethene, $C{H_2} = C{H_2}$
Reaction: $CH \equiv CH\xrightarrow[{ + {H_2}}]{{Ni}}C{H_2} = C{H_2}$