Dear Puneet, this is a very interesting technical question. To the best of my knowledge the structure of 2-azidopyridine depends on the experimental conditions. The linear azido form is preferred in the gas phase and at high temperatures. However, in solution the cyclic tetrazole form prevails. In this context please see the Abstract of the following relevant publication:
A Photoelectron Spectroscopic Study of the 2-Azidopyridine ⇋ Tetrazolo [1.5-α]Pyridine Equilibrium between 391 and 533 K
Article A Photoelectron Spectroscopic Study of the 2-Azidopyridine T...
Also please have a look at the following freely accessible article:
A DFT study of the ionization and electron attachment of 2-azido
pyridine
(please see attached pdf file)
With respect to your planned reaction with an alkyne, please keep in mind that we have an equilibrium between the azide and tetrazole form in solution. This means that even though the tetrazole form may be the predominant form in solution, the compound can still react with your alkyne as linear 2-azidopyridine. Thus please go ahead and give it a try!
Godod luck with your work and best wishes, Frank Edelmann