Question

butane pentane and hexane are called isomers why​

Answer 1

Isomers are compounds with the same molecular formula but different structural formulae. ... For example, pentane has three possible isomers in which one is a linear straight-chain alkane and two are branched alkanes. When branched, the nomenclature can be different because of common and IUPAC names.

Answer 2

Answer:

Butane pentane and hexane are called isomers because they all can be written as compounds with different structural formula.

Explanation:

Butane, for example, has a molecular formula of $c_{4} H_{10}$ which can be written in the form of innumerous structural formulas which all contain the same molecular formula.

One of the isomer of butane is isobutene. Similarly, isomers of pentane are N-pentane, 2-methyl butane, and 2-ethyl propane. Hexane, similarly, can also be expressed as 2-methyl pentane, 2,2,-dimethyl butane, 3-methyl pentane & 2,3-dimethyl butane. The nomenclature might be changing names because of the most common IUPAC names.