Please sort these bonds in decreasing order of strengths..

.

1.C triple bond O

2.C≡N

3.N≡N

4.C−C

5.C−H

And please explain as to why they are correct.

I feel that C−H
is stronger than C−C

Also i read that c triple bond o is the strongest in organic chemistry?
first of all because it has more S overlapping.

But I have no idea about the rest, please give reasons also..

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

Using above information

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Plz answer this query.....................................................................................................

how to represent the possible fischer projections for 2-bromohexane