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With increase in bond order from single → double → triple, bond length and bond enthalpy respectively:
ABond length decreases, bond enthalpy increases
BBoth increase
CBoth decrease
DBond length increases, bond enthalpy decreases
Answer & Solution
Correct answer: A. Bond length decreases, bond enthalpy increases
General rule: ↑ bond order → ↑ bond strength (enthalpy) → ↓ bond length. E.g., N≡N (109 pm, 946 kJ mol⁻¹) vs N–N (single, much longer and weaker).
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