Match List-I with List-II: List-I | List-II A. Melting point ( K) | I. Tl In Ga Al B B. Ionic Radius ( M^+3/ pm) | II. B Tl Al Ga In C. i H1 ( kJ mol^-1) | III. Tl In Al Ga B D. Atomic Radius ( pm) |…

Match List-I with List-II: List-I | List-II A. Melting point ( K)… — Solution | JEE Chemistry

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Match List-I with List-II:

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

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 $13$ elements involving melting point, ionic radius of $\text{M}^{3+}$ , first ionization enthalpy $\Delta_i H_1$ , and atomic radius.

Find: The correct correspondence between List-I and List-II.

The solution is unrelated to this question and discusses organic effects such as electromeric and resonance effects. Therefore, the working could not be extracted from the solution for this question.

Using the available correct answer field, the correct matching is A-IV, B-I, C-II, D-III.

Therefore, the correct option is C.

Common mistakes

Confusing atomic radius with ionic radius is a common error. A $\text{M}^{3+}$ ion is much smaller than the neutral atom because electrons are removed and effective nuclear attraction increases. Match ionic and atomic trends separately.
Assuming all properties vary monotonically down the group is incorrect. In group $13$ , poor shielding by d and f electrons causes irregular trends, especially for Ga and Tl. Check each property independently instead of using a simple top-to-bottom rule.
Mixing up melting point and first ionization enthalpy trends leads to wrong matching. Melting point depends strongly on metallic bonding and structure, whereas $\Delta_i H_1$ depends on atomic size and effective nuclear charge. Do not use one trend to infer the other.

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