JEE Chemistry 2023 Question with Solution

Given: The compound is $\text{Mn}_2\text{O}_7$ and we must identify which structural statements are correct.

Find: The correct option among the given choices.

From the solution, $\text{Mn}_2\text{O}_7$ contains manganese in oxidation state $+7$. Each $\text{Mn}$ atom is tetrahedrally surrounded by oxygen atoms, corresponding to a $\text{MnO}_4^-$-type tetrahedral unit. The molecule also contains an $\text{Mn}-\text{O}-\text{Mn}$ bridge joining the two tetrahedral units.

Thus:

• Statement (A) is correct.
• Statement (B) is incorrect because $\text{Mn}$ is not octahedrally surrounded.
• Statement (C) is correct.
• Statement (D) is incorrect because there is no $\text{Mn}-\text{Mn}$ bond.

Therefore, the correct statements are A and C only. The solution text concludes this explicitly, so the correct option corresponds to option (1).

Hence, the correct option is A.

Given: We analyze the molecular structure of $\text{Mn}_2\text{O}_7$.

Find: Which statements among (A) to (D) are true.

The extracted solution explains the structure as two tetrahedral manganese-oxygen units connected through one bridging oxygen atom. Therefore, each manganese atom has tetrahedral coordination by oxygen atoms, not octahedral coordination.

Also, the linkage between the two manganese centers is:

and not a direct:

bond.

So the true statements are (A) and (C) only.

Verification: The answer key says (1) A and C only, and the explanatory part of the solution agrees. Although the header says Option B, that conflicts with the actual written conclusion and structure explanation. Using the worked explanation as authority, the correct answer is option (1).

Therefore, the correct option is A.