Cyanide molecule is triple bond formed.it have lower bond length but bond strength are very high.but 2H molecule are bond length very high but bond strength is very low because multiple bonds are stronger than single bond.

Hello Usha! For this question I would recommend you to go for wikipedia. Search there and you will get the result. You will get much better explaination there and all your doubts will be cleared because of the through understanding of the concept. Hope this helps.