Chemistry · CHEMICAL BONDING AND MOLECULAR STRUCTURE

Which of the following orders correctly represents the decreasing order of bond lengths among the given carbon-carbon and carbon-nitrogen bonds?

\( \text{C}-\text{C} > \text{C}=\text{C} > \text{C}-\text{N} > \text{C}\equiv\text{C} > \text{C}=\text{N} > \text{C}\equiv\text{N} \)
\( \text{C}-\text{N} > \text{C}-\text{C} > \text{C}=\text{N} > \text{C}=\text{C} > \text{C}\equiv\text{N} > \text{C}\equiv\text{C} \)
\( \text{C}-\text{C} > \text{C}-\text{N} > \text{C}=\text{C} > \text{C}=\text{N} > \text{C}\equiv\text{C} > \text{C}\equiv\text{N} \)
\( \text{C}-\text{C} > \text{C}-\text{N} > \text{C}=\text{N} > \text{C}=\text{C} > \text{C}\equiv\text{N} > \text{C}\equiv\text{C} \)

Correct answer · Option 3

\( \text{C}-\text{C} > \text{C}-\text{N} > \text{C}=\text{C} > \text{C}=\text{N} > \text{C}\equiv\text{C} > \text{C}\equiv\text{N} \)

From Table 4.2: C-C (154 pm) > C-N (143 pm) > C=C (133 pm) > C=N (128 pm) > C#C (120 pm) > C#N (116 pm).