Bond length decreases in the order
- A. single, double, triple
- B. triple, double, single
- C. double, single, triple
- D. all are equal
Explanation
More shared pairs pull the nuclei closer, so a triple bond is shorter than a double and a double shorter than a single, with carbon to carbon lengths of about 0.120, 0.134 and 0.154 nm respectively. Bond energy runs the opposite way, rising as the bond shortens. Bond order, length and strength are always linked in this pattern.