Question

rn2cl is unstable but arn2cl is stable why​

Answer 1

Answer:

Compounds with triple bonds generally seem to be unstable. HCNHCN and C2H2CX2HX2 are high-energy, relatively short-lived molecules that will readily polymerise or react with other organic molecules. My naïve mental picture is that they don't really want to have a triple bond because the geometry makes it awkward, so they'll do anything to transfer an electron somewhere else and turn it into a double or a single bond instead.

But N2NX2 seems to be an exception. By my naïve reasoning, when an N2NX2 meets an organic molecule it should be eager to shrug off its triple bond and join the party. But in fact this doesn't happen, and nitrogen fixing organisms have to do quite a bit of work to get nitrogen to participate in organic molecules.

So my question is, what is it about N2NX2 that makes its triple bond so energetically favourable while C≡CC≡C and C≡NC≡N bonds are so unfavourable?

Note that this question isn't about reactivity with O