Bond length decreases in the order
Correct answer: A. single, double, triple
- 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.
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About Bond Energy
Bond energy is the energy needed to break one mole of a particular covalent bond in gaseous molecules, while bond formation releases energy. Reaction enthalpy is estimated by subtracting the total energy of bonds formed from bonds broken, with attention to average bond energies and their limitations for specific molecules.
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