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NEET Chemistry Coordination Compounds 2026 NEET 2026 (Re-NEET)

NEET Chemistry Question (2026) — Solution

Question

Given below are two statements: Statement-I : [ Fe(ox) _3]^ 3- is chiral. Statement-II : trans -[ Cr(H _2 O )_2( ox )_2]^- is chiral. (Given : oxH_2 = HOOC-COOH) In light of the above statements, choose the most appropriate answer from the options given below:

Options

  1. A. Statement-I is incorrect but Statement-II is correct.
  2. B. Both Statement-I and Statement-II are correct.
  3. C. Both Statement-I and Statement-II are incorrect.
  4. D. Statement-I is correct but Statement-II is incorrect.

Answer

D. Statement-I is correct but Statement-II is incorrect.

Step-by-step solution

Statement-I: [ Fe(ox) _3]^ 3- is an octahedral complex of the type [M(AA)_3]. It lacks any plane of symmetry or center of inversion. Hence, it is optically active and chiral. Statement-I is correct. Statement-II: trans -[ Cr(H _2 O )_2( ox )_2]^- is an octahedral complex of the type trans -[M(AA)_2a_2]. In the trans isomer, the two identical monodentate ligands are placed opposite to each other. This geometry possesses a plane of symmetry passing through the metal and the bidentate ligands, as well as a center of inversion. Hence, it is optically inactive and achiral. Statement-II is incorrect. Therefore, Statement-I is correct but Statement-II is incorrect. Answer: Statement-I is correct but Statement-II is incorrect.

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