Q65 / 180 · NEET 2026 (Re-NEET) · Chemistry

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

  • A
    Statement-I is incorrect but Statement-II is correct.
  • B
    Both Statement-I and Statement-II are correct.
  • C
    Both Statement-I and Statement-II are incorrect.
  • Correct answer
    D
    Statement-I is correct but Statement-II is incorrect.

Solution

Statement-I: $[\text{Fe(ox)}_3]^{3-}$ 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: $\textit{trans}-[\text{Cr(H}_2\text{O})_2(\text{ox})_2]^-$ is an octahedral complex of the type $\textit{trans}-[M(AA)_2a_2]$. 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.

Hence, the correct answer is option: 'D'.

Relevant Questions