A structural formula is an unambiguous description of the way the atoms in a molecule are arranged because it shows the connectivity of the atoms and the type of bonds between them. 'Unambiguous' means that the structural formula provides a single, definite representation of the molecule's structure. There is only one way to draw a structural formula for a given molecule. This eliminates any possibility of different interpretations or isomers being represented by the same formula. For example, CH₂=CH₂ (ethene), CH₃CH₂OH (ethanol), and CH₃COOCH₃ (methyl acetate) each have only one possible structural formula, ensuring a clear and precise representation of their molecular arrangement.

Displayed Formula:

N H

Name of Compound: Ammonia

What the displayed formula tells us: The displayed formula shows the actual number of atoms of each element in one molecule. The chemical formula for ammonia is NH₃, indicating one nitrogen atom and three hydrogen atoms. The displayed formula confirms this, showing one nitrogen atom bonded to three hydrogen atoms.

The statement "All alkanes have the same boiling point" is incorrect because homologous series do not have the same physical properties. While they share a common functional group (the C-H bond) and a common general formula (C_nH_2n+2), the size of the molecules within the series increases as 'n' increases. Larger molecules have greater intermolecular forces (specifically, van der Waals forces) due to a larger surface area for contact. This leads to stronger intermolecular forces and therefore higher boiling points.

As you move down the alkane series (i.e., as 'n' increases), the boiling point increases. This is because the larger molecules have stronger London dispersion forces. The boiling point trend is predictable and consistent with the characteristics of a homologous series – a gradual change in physical properties with each incremental addition of a -CH₂- unit.