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BITSAT 2014
Exam
BITSAT
Year
2014
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

BITSAT 2014 · Chemistry · Chemical Bonding and Molecular Structure

The correct order of increasing C-O bond length CO, CO_ 3 ^ 2- ,...

The correct order of increasing C−O\mathrm{C}-\mathrm{O} bond length CO,CO32−,CO2\mathrm{CO}, \mathrm{CO}_{3}^{2-}, \mathrm{CO}_{2} is:The correct order of increasing C-O bond length CO, CO_ 3 ^ 2- , CO_ 2 is:

Options

  1. ACO<CO2<CO32−\mathrm{CO}< \mathrm{CO}_{2}< \mathrm{CO}_{3}^{2-}
  2. BCO2<CO32−<CO\mathrm{CO}_{2}< \mathrm{CO}_{3}^{2-}< \mathrm{CO}
  3. CCO<CO32−<CO2\mathrm{CO}< \mathrm{CO}_{3}^{2-}< \mathrm{CO}_{2}
  4. DCO32−<CO3<CO\mathrm{CO}_{3}^{2-}< \mathrm{CO}_{3}< \mathrm{CO}

Correct answer

A. CO<CO2<CO32−\mathrm{CO}< \mathrm{CO}_{2}< \mathrm{CO}_{3}^{2-}

Step-by-step solution

C≡Ohas\mathrm{C} \equiv \mathrm{Ohas} lowest bond length due to highest bond order. O=C=O\mathrm{O}=\mathrm{C}=\mathrm{O} has second lowest bond length due to double bond. The correct order of increasing C-O bond length CO, CO_ 3 ^ 2- , CO_ 2 is:
has highest has bond length due to lowest bond order which is due to resonance.
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