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Iso-propane and sec-propane are both isomers of propane, meaning they have the same molecular formula (C3H8) but different structural formulas.
Iso-propane, also known as 2-methylpropane, has a branched structure with a central carbon atom bonded to three hydrogen atoms and one methyl group (-CH3). The other two carbon atoms are bonded to two hydrogen atoms each.
Sec-propane, also known as 1-methylpropane, has a linear structure with one carbon atom at each end bonded to three hydrogen atoms. The middle carbon atom is bonded to two hydrogen atoms and one methyl group (-CH3).