Are you asking the mechanism or you want to know procedure (including reagents)?

Do you care about the geometry of the final product? Can you propose what the final compound you want actually is?

Without knowing final desire it is difficult to say something about this dear

Please see the link bellow: https://chemistry.stackexchange.com/questions/76469/why-should-the-temperature-be-maintained-at-0-5-c-in-a-diazotisation.

My regards

Because the group R-N2+X- is a 'N2' containing group. N2 is a gas (entropically favored) and is also very very stable (thermodynamic favored). The 'expulsion' of N2 from the parent molecule is the driver force for diazocompound s decomposition

i think at high temperature the force of attraction between N2+ and X- diminishes hence destabilisation will be occurs and N2 act as good leaving group ...so chances to any reactions like nucleophillic