The isomer(s) of [Co(NH3)4Cl2] that has/have a Cl–Co–Cl angle of 90°, is/are:
Coordination Compounds · Class 12 · JEE Main Previous Year Question
The isomer(s) of that has/have a Cl–Co–Cl angle of 90°, is/are:
- a
meridional and trans
- b
cis and trans
- c
trans only
- d✓
cis only
cis only
🧠 Cl–Co–Cl = 90° Means Cis
In octahedral :
- cis: Cl atoms at adjacent positions → Cl–Co–Cl bond angle = 90°.
- trans: Cl atoms at opposite positions → Cl–Co–Cl angle = 180°.
🗺️ Geometric Picture
In octahedral geometry:
- Adjacent (cis) bonds make 90° angles.
- Opposite (trans) bonds make 180° angles.
So a 90° Cl–Co–Cl angle is the signature of cis isomer.
⚡ Octahedral Bond Angles
| Position pair | Angle | |---|---| | Cis (adjacent) | 90° | | Trans (opposite) | 180° | | Diagonal (face) | 70.5° (mid of two 90° edges) |
⚠️ mer/fac Don't Apply to
mer and fac are reserved for types. For (), only cis/trans terminology applies.
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