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JEE Main20208 Jan 2020Evening ShiftChemistryAldehydes and KetonesActual

The correct order of the calculated spin-only magnetic moments of complexes A to D is: A N i C O 4 B N i H 2 O 6 C l 2 C N a 2 N i C N 4 D P d C l 2 P P h 3 2

Options

  1. AA ≈ C < B ≈ D
  2. BC < D < B < A
  3. CC ≈ D < B < A
  4. DA ≈ C ≈ D < B

Correct answer

D. A ≈ C ≈ D < B

Step-by-step solution

P d P P h 3 2 C l 2 , P d 2 + = 4 d 8 , M = 0 N i C O 4 , N i = 3 d 8 4 s 2 S F L , M = 0 N i C N 4 2 - N i 2 + = 3 d 8 S F L M = 0 N i H 2 O 6 2 + N i 2 + = 3 d 8 W F L t 2 g 2 , 2 , 2 , e g 1 , 1 So, unpaired electron is 2 , M = 8 B M

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