Question

question 71
different bonds are found in h₂o, co₂, and hcn. arrange the four different bonds in order of increasing bond length.
c=o
h-c
c≡n
h-o
increasing bond length
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Explanation:

Bond length is related to the type of bond. Triple bonds (\(C\equiv N\)) are shorter than double bonds (\(C = O\)) because of the greater number of shared electrons (more electron - electron repulsion in the bonding region pulls the nuclei closer). Single bonds (\(H - C\) and \(H - O\)) are longer. Comparing \(H - C\) and \(H - O\), oxygen is more electronegative than carbon, but the main factor is atomic size. Carbon and hydrogen have more similar atomic sizes compared to oxygen and hydrogen. Since oxygen is larger than carbon (in the same period, atomic size increases from left to right), the \(H - O\) bond is longer than the \(H - C\) bond.

Answer:

\(C\equiv N