Question

Formation of [M(en)\(_3\)]\(^{2+}\) from [M(H\(_2\)O)\(_6\)]\(^{2+}\) and three equivalents of ethylenediamine (en) is LEAST favored when M is

• A. Co
• B. Ni
• C. Cu
• D. Fe

Hint:

For first-row M\(^{2+}\) octahedral complexes, remember the Irving--Williams order: Mn < Fe < Co < Ni < Cu > Zn. Chelate effect increases stability for all metals, but {comparative} stability still follows this metal-dependent trend. Use LFSE (and Jahn--Teller for d\(^9\)) to rationalize deviations and strengths.

Answer 1

The Correct Option is D

Step 1: Carefully examine the relationship between the two given words "Arena" and "Conflict." An arena is not a random place; it is a specific setting or venue where battles, competitions, or conflicts are carried out. In ancient times gladiators fought in arenas, while in modern usage even political debates or sports fields are described as “arenas of conflict.” Therefore, the connection is: “Arena is a place where Conflict occurs.”

Step 2: Now, evaluate each of the given options in detail to find which one reflects the same type of relationship.
(A) School : Teacher → A school is an institution where teachers work, but the defining idea of a school is not “teacher” but “education.” Hence, this does not match the “place : event” type relation.

(B) Forum : Discussion → A forum is a venue, whether physical or virtual, where discussions, debates, and exchanges of ideas take place. Its very purpose is to host discussions. This directly parallels the original analogy: just as an arena is a place for conflict, a forum is a place for discussion.

(C) Library : Books → A library is a place where books are stored. This shows a “place : object” relationship rather than “place : event.” It does not fit the same logic as Arena : Conflict.

(D) Kitchen : Food → A kitchen is a place where food is prepared or cooked. This represents a “place : product” connection, not “place : activity/event.” Thus, it is also not a correct parallel.

Step 3: By carefully comparing all the choices, we see that the only option which follows the same pattern is Forum : Discussion. Just as an arena is characterized by the conflicts that happen inside it, a forum is characterized by the discussions that take place there.

Final Answer: (B) Forum : Discussion