The correct answer is A. C4H10.
Isobutane is a hydrocarbon with the molecular formula C4H10. It is a colorless, odorless gas that is used as a fuel and refrigerant. It is also found in natural gas and petroleum.
Isobutane is a branched-chain alkane. It has four carbon atoms and ten hydrogen atoms. The carbon atoms are arranged in a chain with a branch off of one of the carbon atoms. This branching makes isobutane less stable than n-butane, which is a straight-chain alkane with the same molecular formula.
Isobutane can be produced by the cracking of larger hydrocarbons, such as petroleum. It can also be produced by the isomerization of n-butane.
Isobutane is used as a fuel in internal combustion engines. It is also used as a refrigerant and as a solvent.
Option B, C4H8, is the molecular formula of 2-butene. 2-Butene is an alkene, which is a hydrocarbon with a double bond. It is a colorless, flammable gas that is used as a fuel and in the production of other chemicals.
Option C, C3H8, is the molecular formula of propane. Propane is a hydrocarbon with the molecular formula C3H8. It is a colorless, odorless gas that is used as a fuel and in the production of other chemicals.
Option D, C3H6, is the molecular formula of propylene. Propylene is an alkene, which is a hydrocarbon with a double bond. It is a colorless, flammable gas that is used as a fuel and in the production of other chemicals.