The isomer (s) of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]$ that has/have a $\mathrm{Cl}-\mathrm{Co}-\mathrm{Cl}$ angle of $90^{\circ}$, is/are :

JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Coordination Compounds

The isomer (s) of

[Co (NH_{3})_{4} Cl_{2}]

that has/have a

Cl - Co - Cl

angle of

9 0^{\circ}

, is/are :

(A)meridional and trans
(B)cis only✓ Correct
(C)trans only
(D)cis and trans

Answer: (B)

Solution

In the octahedral complex

[Co (N H_{3})_{4} C l_{2}]

the two chlorides can be either adjacent or opposite. In the cis isomer they occupy neighbouring positions with a

Cl - Co - Cl

angle of

9 0^{\circ}

, while in the trans isomer they lie across the metal at

18 0^{\circ}

. Only the cis arrangement gives a

Cl - Co - Cl

angle of

9 0^{\circ}

JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Single correct option

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