Long per n in pyridin is not avairabl but ong per nytrogen in pyole is avairabl ?
It seems like you are asking about the availability of the length of a bond in pyridine and pyrrole. To understand why the length of a bond differs in these two molecules, we need to look at their structures and chemical properties.
Pyridine and pyrrole are both heterocyclic compounds and are structurally similar, but they differ in terms of their electronic properties. In pyridine, there is a nitrogen atom in the heterocyclic ring, while in pyrrole, there is a nitrogen atom as well as an additional double-bonded carbon in the ring.
The length of a bond is influenced by several factors, including the number and types of atoms involved and their electronic distribution. In the case of pyridine, the nitrogen atom has a lone pair of electrons, which is not effectively delocalized due to the aromaticity of the compound. As a result, the bond between the nitrogen atom and the carbon atom is shorter.
However, in pyrrole, the additional double-bonded carbon atom in the ring effectively delocalizes the lone pair of electrons on the nitrogen atom. This delocalization contributes to the aromaticity of pyrrole, making it more stable. Due to this delocalization, the bond between the nitrogen atom and the carbon atom is longer compared to pyridine.
To determine the specific lengths of the bonds, one can consult experimental data or use computational tools that predict bond lengths based on molecular structures. These tools include quantum chemical calculations using software such as Gaussian, NWChem, or other molecular modeling packages.
In summary, the availability of the bond lengths in pyridine and pyrrole can be determined by analyzing their structures, electronic properties, and employing experimental or computational methods.