Compounds that have the same molecular formular but different structures are said to be

Explanation

Compounds that have the same molecular formula but different structures are calledisomers. Isomers are classified into various types based on the kind of structural differences present. There are two main types of isomers: structural isomers and stereoisomers.

Structural isomers have the same molecular formula but differ in how the atoms are connected. For example, butane (C₄H₁₀) has two structural isomers: n-butane and isobutane. In n-butane, the carbon atoms are arranged in a straight chain, while in isobutane, they form a branched structure.

Stereoisomers have the same molecular formula and the same connectivity of atoms but differ in the spatial arrangement of the atoms. Stereoisomers can be further divided into two types: geometrical isomers (also known as cis-trans isomers) and optical isomers (also known as enantiomers).

It is important to note that the other options are not relevant to the concept of isomers. Allotropes are different forms of the same element in the same physical state, such as diamond and graphite (both forms of carbon). Polymers are large molecules made up of repeating units called monomers. Isotopes are atoms of the same element that have different numbers of neutrons, leading to different atomic masses.