Name the gas which is filled in wick-type lighters.

Correct option is A

The correct answer is (A)   Butane

Butane 

• Butane is a colorless, flammable gas that belongs to the alkane family of hydrocarbons. Its chemical formula is C₄H₁₀. It is commonly found in two forms: n-butane and isobutane (a structural isomer).
• Uses of Butane: Used as a fuel in lighters and portable stoves.   Added to LPG (Liquefied Petroleum Gas) for cooking and heating.
• Used as a refrigerant and a propellant in aerosol sprays.
• Properties: Easily liquefied under pressure.
•   Burns with a blue flame, producing carbon dioxide and water.
•   Highly flammable and must be handled with care.

Information booster:

Nitrogen 

• Nitrogen is a colorless, odorless, and tasteless gas that makes up about 78% of Earth's atmosphere. Its chemical symbol is N, and its molecular form is N₂.
• Uses of Nitrogen: Widely used in the production of fertilizers.
•   Used in the food industry to preserve freshness by replacing oxygen.
•     Employed in the manufacturing of ammonia and other chemicals.

Helium

• ​Helium is a colorless, odorless, and tasteless gas that is lighter than air.
• It is the second most abundant element in the universe, after hydrogen, and has the chemical symbol He.
• It is a noble gas, meaning it is chemically inert and does not easily form compounds with other elements.

Methane

• ​Methane is a colorless, odorless, and highly flammable gas with the chemical formula CH₄.
• It is the main component of natural gas and is used as a fuel in homes and industries.​