Final answer:
Butane is a straight-chain alkane, while 2-methylpropane is a branched-chain isomer of butane.
Step-by-step explanation:
The student's statement is false. Butane is a straight-chain alkane with the chemical formula C4H10. It consists of a continuous chain of four carbon atoms, with each carbon atom bonded to two hydrogen atoms. There are no branches or other carbon atoms bonded to more than two carbon atoms in butane's structure.
On the other hand, 2-methylpropane (isobutane) is a structural isomer of butane. It has the same chemical formula (C4H10) but a different arrangement of atoms. 2-methylpropane has a branched chain, with one carbon atom in the center bonded to three other carbon atoms.
In conclusion, butane is an unbranched compound with the condensed formula C4H10, while 2-methylpropane is a branched-chain isomer of butane. Therefore, the given statement is false.