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Question: Answered & Verified by Expert
The number and type of bonds in C22- ion in CaC2 are:
ChemistryChemical Bonding and Molecular StructureJEE MainJEE Main 2014 (09 Apr Online)
Options:
  • A Two σ-bonds and two π-bonds
  • B One σ-bond and two π-bonds
  • C One σ-bond and one π-bond
  • D Two σ-bonds and one π-bond
Solution:
2181 Upvotes Verified Answer
The correct answer is: One σ-bond and two π-bonds
The structure of calcium carbide is:

Ca2+C≡C2-

Both C atoms are sp hybridised. The carbide anion, having 2 units of negative charge between two carbon atoms, has 1 σ and 2 π bonds.
 

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