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JEE Chemistry 2023 Question with Solution

Match List I with List II

Table matching List I complexes A to D with List II CFSE values I to IV for coordination compounds.

Choose the correct answer from the options given below:

  • A

    A-I, B-IV, C-II, D-III.

  • B

    A-II, B-III, C-I, D-IV.

  • C

    A-I, B-II, C-IV, D-III.

  • D

    A-III, B-IV, C-I, D-II.

Answer

Correct answer:D

Step-by-step solution

Standard Method

Given: A match-the-list question between coordination complexes and their CFSE (Δo)(\Delta_o) values.

Find: The correct correspondence between A, B, C, D and I, II, III, IV.

The solution is inconsistent with the question body and discusses a different chemistry question. However, it explicitly concludes that the correct option is D.

From the image, the matching is read as:

  • A: [Cu(NH3)6]2+[Cu(NH_3)_6]^{2+}
  • B: [Ti(N2O)6]3+[Ti(N_2O)_6]^{3+}
  • C: [Fe(CN)6]3−[Fe(CN)_6]^{3-}
  • D: [NiF6]4−[NiF_6]^{4-}

List II gives:

  • I = −0.6-0.6
  • II = −2.0-2.0
  • III = −1.2-1.2
  • IV = −0.4-0.4

Thus, using the solution's conclusion, the correct option is D, i.e.

  • A-III, B-IV, C-I, D-II.

Therefore, the correct option is D.

Source discrepancy note

The solution contains an unrelated explanation about methane, steam, and hydrogen generation, which does not correspond to this coordination chemistry match-the-list question. The only relevant grounded information available from the solution block is the explicit statement "The Correct Option is D". Therefore, the answer is taken as D from the source conclusion, while noting that the worked explanation could not be reliably extracted for this question.

Common mistakes

  • Students often confuse CFSE ordering with simple ligand strength ranking alone. This is wrong because the metal oxidation state and electronic configuration also matter. Determine the dnd^n count first, then apply octahedral splitting.

  • A common mistake is ignoring whether the complex is weak-field or strong-field before assigning electron distribution. This leads to incorrect pairing assumptions. Use the ligand identity, such as CN−CN^- as strong field and F−F^- as weak field, before estimating CFSE.

  • Some students match the numerical values by magnitude only and forget the sign convention shown in the table. This is incorrect because the listed CFSE values are negative stabilization energies. Keep the given sign convention unchanged while matching.

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