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MCQMediumJEE 2024Group 13 Elements

JEE Chemistry 2024 Question with Solution

Match List-I with List-II:

List-I | List-II A. Melting point (K\text{K}) | I. Tl > In > Ga > Al > B B. Ionic Radius (M+3/pmM^{+3}/\text{pm}) | II. B > Tl > Al ≈ Ga > In C. ΔiH1\Delta_i H_1 (kJ mol−1\text{kJ mol}^{-1}) | III. Tl > In > Al > Ga > B D. Atomic Radius (pm\text{pm}) | IV. B > Al > Tl > In > Ga

  • A

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

  • B

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

  • C

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

  • D

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

Answer

Correct answer:C

Step-by-step solution

Standard Method

Given: A matching question on periodic properties of group 1313 elements.

Find: The correct correspondence between melting point, ionic radius of M3+M^{3+}, ΔiH1\Delta_i H_1 and atomic radius with the given orders.

The solution is unrelated to this question and discusses electronic effects in organic chemistry. Therefore, the answer is resolved from the given correct answer field.

From the stated correct answer:

A−IV,  B−I,  C−II,  D−IIIA - IV,\; B - I,\; C - II,\; D - III

This corresponds to Option C.

Therefore, the correct option is C.

Answer Source Check

Given: The answer key states (3) A-IV, B-I, C-II, D-III.

Find: The option label corresponding to this mapping.

Compare with the options:

  1. A−III,  B−IV,  C−I,  D−IIA-III,\; B-IV,\; C-I,\; D-II
  2. A−II,  B−III,  C−IV,  D−IA-II,\; B-III,\; C-IV,\; D-I
  3. A−IV,  B−I,  C−II,  D−IIIA-IV,\; B-I,\; C-II,\; D-III
  4. A−I,  B−II,  C−III,  D−IVA-I,\; B-II,\; C-III,\; D-IV

The mapping exactly matches option (3).

Hence the answer label is C.

Common mistakes

  • Confusing atomic radius with ionic radius is a common mistake. They do not follow identical trends because formation of M3+M^{3+} changes electron count and effective nuclear attraction. Match each property independently.

  • Students often ignore the effect of poor shielding by d and f electrons in heavier group 1313 elements. This can distort simple top-to-bottom trends. Use the actual periodic trend rather than assuming a smooth monotonic increase.

  • Mixing up melting point order with ionization enthalpy order leads to incorrect matching. Melting point depends strongly on bonding and structure in the element, whereas ΔiH1\Delta_i H_1 depends on electron removal from isolated atoms.

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