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AP EAMCET20224 Jul 2022Morning ShiftChemistryChemical Bonding and Molecular StructureActual

The bond lengths of C 2 , N 2 and B 2 molecules are X 1 , X 2 and X 3 pm respectively. The correct order of their bond lengths is

Options

  1. AX 3 > X 1 > X 2
  2. BX 2 > X 3 > X 1
  3. CX 1 > X 2 > X 3
  4. DX 1 > X 3 > X 2

Correct answer

A. X 3 > X 1 > X 2

Step-by-step solution

Bond length is inversely related to bond order. The bond orders of given molecules can be calculated using molecular orbital theory. bond   order   = Number   of   BMO   e - - Number   of   ABMO   e - 2 BMO = Bonding molecular orbital ABMO = Anti bonding molecular orbital The molecular orbital electronic configuration of B 2 is σ 1 s 2 σ * 1 s 2 σ 2 s 2 σ * 2 s 2 π 2 p x 1 = π 2 p y 1 BO   of   B 2 = 6 - 4 2 = 1 The molecular orbital el

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