JEE Main 2025 Jan 23 Shift 1, Chemistry Q11: Isomerism In Co-ordination Compounds

JEE Main2025Jan 23, Shift 1Chemistry

The complex that shows Facial - Meridional isomerism is

A
$[C o (N H_{3})_{3} C l_{3}]$
B
$[C o (N H_{3})_{4} C l_{2}]^{+}$
C
$[C o (e n)_{3}]^{3 +}$
D
$[C o (e n)_{2} C l_{2}]^{+}$

Solution

Facial (fac) and meridional (mer) isomerism appears in octahedral complexes of the type $M a_{3} b_{3}$ . The three $a$ ligands can either occupy one triangular face (fac) or sit along a meridian (mer).

Classifying each option:

(1) $[C o (N H_{3})_{3} C l_{3}]$ is $M a_{3} b_{3}$ - shows fac/mer.

(2) $[C o (N H_{3})_{4} C l_{2}]^{+}$ is $M a_{4} b_{2}$ - shows cis/trans only.

(3) $[C o (e n)_{3}]^{3 +}$ is $M (AA)_{3}$ - shows optical isomerism only.

(4) $[C o (e n)_{2} C l_{2}]^{+}$ is $M (AA)_{2} b_{2}$ - shows cis/trans (and optical) only.

$∴$ Option (1).

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JEE Main 2025 Jan 23 Shift 1, Chemistry Q11: Isomerism In Co-ordination Compounds

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