What is the systematic name of a colourless gas with a faint, ethereal odour called acetylene, widely used for welding?

Correct option is A

The correct answer is (a) Ethyne.
The systematic name of the colorless gas with a faint, ethereal odor, commonly known as acetylene and widely used for welding, is Ethyne.
Ethyne (C2H2) is a colorless, highly flammable gas with a faint, ethereal odor.
It is slightly soluble in water and is lighter than air.
Ethyne, also known as acetylene, is widely used in oxy-fuel welding and cutting processes due to its high flame temperature.
It is also used in the chemical industry as a building block for the synthesis of various organic compounds.
Facts to remember:
Ethanoic Anhydride:
Systematic Name: Ethanoic Anhydride (common name: Acetic Anhydride)
Chemical Formula: (CH3CO)2O
Properties: Ethanoic anhydride is a colorless liquid with a pungent odor. It is highly reactive and can cause severe burns upon contact with skin. It is soluble in many organic solvents but reacts violently with water.
Azoethane:
Systematic Name: Azoethane (common name: Ethyl Azide)
Chemical Formula: C2H5N3
Properties: Azoethane is a colorless, volatile liquid with a sweet, ethereal odor. It is highly explosive and sensitive to shock and heat. Azoethane is not commonly used due to its hazardous nature.
Usage: Azoethane has limited practical applications and is primarily used in research laboratories for its explosive properties and in the synthesis of azides.