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JEE Advanced levelSingle correct optionDifficulty 3 of 3g1095

In the guanidinium cation, , the positive charge is delocalised over the three nitrogen atoms by resonance. Assuming that the three equivalent contributing structures each have one double bond and two single bonds, the C-N bond order in the hybrid is

  1. A1.50
  2. B1.00
  3. C1.33
  4. D2.00

Answer: C

Each C-N bond is double in one of the three equivalent structures and single in two. The hybrid bond order is . This is between a single and a double bond, and all three C-N bonds are equal in length.
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